fixed postInstall (did not handle non 'so' file cases anymore)

Add 'invocationHandler' js field to dynamic proxies which returns the original 'functions' object.

Support for java -source 1.8
Also change Travis to use 3x3 test matrix (jdk x nvm).

Add support for Java 8.

The previous test worked correctly with the Oracle JVM but
failed with other JVMs. This new test should work correctly
on all JVMs.

…-unsupported-java-version

Use better test for UnsupportedClassVersionError.

Fixes compile issue with snprintf on windows

…efinements.

…tead of 'suffix'.

Joe, I implemented an onJvmCreated callback so I could do the promisification
from javascript instead of C++. Let me know if you have reservations about
this approach.

There is a latent bug when using OpenJDK6 that I discovered while
working on this test. The bug has nothing to do with promises,
as the same behavior happens on the master branch.
See joeferner#186

Support for Promises/A+

Previously it was only reporting errors if the returned directory was
an empty string, so invalid path constructs were being returned.

The returned error message is also improved, so any bad path constructs
are visible during a failed installation.

Improve visibility of install problems

(This fixes building the package only. joeferner#515 prevents it from actually working.)

Always pass strings as const-ref and don't modify caller values, for
correct error messages.

This prevents the "null caller frame" error in recent
JDKs. Additionally, if running on JDK 9+, search class hierarchy for a
accessible method to invoke. This makes Arrays.asList(...).toArray()
work.

Prevents ConcurrentModificationException in JDK 20.

Only notable behaviour broken with empty string promise suffix was
static method calls on imported classes.
(java.import('...').staticMethod())

This is due to double-promisification of callStaticMethod function. This
change extracts raw, pre-promisified methods used later in runtime by
java bridge as local variables and uses that instead.

This also fixes a similar breakage if someone set "Sync" as promise
suffix.

Bumps [async](https://github.com/caolan/async) from 2.6.1 to 2.6.4.
- [Release notes](https://github.com/caolan/async/releases)
- [Changelog](https://github.com/caolan/async/blob/v2.6.4/CHANGELOG.md)
- [Commits](caolan/async@v2.6.1...v2.6.4)

---
updated-dependencies:
- dependency-name: async
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Bumps [minimist](https://github.com/minimistjs/minimist) from 1.2.5 to 1.2.8.
- [Release notes](https://github.com/minimistjs/minimist/releases)
- [Changelog](https://github.com/minimistjs/minimist/blob/main/CHANGELOG.md)
- [Commits](minimistjs/minimist@v1.2.5...v1.2.8)

---
updated-dependencies:
- dependency-name: minimist
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>

Bumps [qs](https://github.com/ljharb/qs) from 6.5.2 to 6.5.3.
- [Release notes](https://github.com/ljharb/qs/releases)
- [Changelog](https://github.com/ljharb/qs/blob/main/CHANGELOG.md)
- [Commits](ljharb/qs@v6.5.2...v6.5.3)

---
updated-dependencies:
- dependency-name: qs
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>

Bumps [semver](https://github.com/npm/node-semver) from 5.7.1 to 5.7.2.
- [Release notes](https://github.com/npm/node-semver/releases)
- [Changelog](https://github.com/npm/node-semver/blob/v5.7.2/CHANGELOG.md)
- [Commits](npm/node-semver@v5.7.1...v5.7.2)

---
updated-dependencies:
- dependency-name: semver
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>

Bumps [http-cache-semantics](https://github.com/kornelski/http-cache-semantics) from 4.1.0 to 4.1.1.
- [Commits](kornelski/http-cache-semantics@v4.1.0...v4.1.1)

---
updated-dependencies:
- dependency-name: http-cache-semantics
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>

Bumps [ansi-regex](https://github.com/chalk/ansi-regex) from 4.1.0 to 4.1.1.
- [Release notes](https://github.com/chalk/ansi-regex/releases)
- [Commits](chalk/ansi-regex@v4.1.0...v4.1.1)

---
updated-dependencies:
- dependency-name: ansi-regex
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>

Bumps [debug](https://github.com/debug-js/debug) from 4.1.1 to 4.3.4.
- [Release notes](https://github.com/debug-js/debug/releases)
- [Commits](debug-js/debug@4.1.1...4.3.4)

---
updated-dependencies:
- dependency-name: debug
  dependency-type: indirect
...

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Bumps [json-schema](https://github.com/kriszyp/json-schema) and [jsprim](https://github.com/joyent/node-jsprim). These dependencies needed to be updated together.

Updates `json-schema` from 0.2.3 to 0.4.0
- [Commits](kriszyp/json-schema@v0.2.3...v0.4.0)

Updates `jsprim` from 1.4.1 to 1.4.2
- [Changelog](https://github.com/TritonDataCenter/node-jsprim/blob/v1.4.2/CHANGES.md)
- [Commits](TritonDataCenter/node-jsprim@v1.4.1...v1.4.2)

---
updated-dependencies:
- dependency-name: json-schema
  dependency-type: indirect
- dependency-name: jsprim
  dependency-type: indirect
...

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Bumps [minimatch](https://github.com/isaacs/minimatch) from 3.0.4 to 3.1.2.
- [Changelog](https://github.com/isaacs/minimatch/blob/main/changelog.md)
- [Commits](isaacs/minimatch@v3.0.4...v3.1.2)

---
updated-dependencies:
- dependency-name: minimatch
  dependency-type: indirect
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Co-authored-by: Steven Hargrove <steven.hargrove@telrite.com>