fix support for Imm(Map|Set|Vector)

update docs

Add examples/ to export-ignore

Add sprintf versions of script-related functions

Add HackBuilderKeys::lambda() and HackBuilderValues::lambda()

More convenient than subclassing for one-offs.

fixes hhvm#31

Update type-assert dependency to a version that supports 3.18

Support for HHVM 3.18

Merge pull request hhvm#15 from facebook/fredemmott-patch-1

Don't include .hhconfig in git export results

Merge pull request hhvm#10 from facebook/filetypes

Add support for php and decl file types

Merge pull request hhvm#8 from facebook/namespace

Support setting and using namespaces