fix schema request params error (ucloud#11)

improving unit test for core modules (ucloud#9)

FEATURE:

- Add testing framework supported `scenario` and `step`, inspire by *ThoughtWorks, Guage* (ucloud#9)

ENHANCEMENT:

- Add unit testing cases to improving line coverage at core modules. (ucloud#9)
- Improved CI workflow. (ucloud#9)

BUGFIX:

- Fix JSON decoding error for py3.5. (ucloud#9)

Add stepflow sdk (ucloud#8)

FEATURE:

- Add the SDK of `StepFlow` product (ucloud#8)

BUGFIX:

- Fix the `NoneType` error for `RetCodeException` (ucloud#8)

enhancement schema for response case-insensitive and miss key (ucloud#7)

FEATURE:

- Set zero-value as the default value for container types (list, dict) (ucloud#7)
- Add case-insensitive converting at the schema (ucloud#7)
- Add non-strict mode for the type system (ucloud#7)

fix eip typo and object schema (ucloud#6)

BUGFIX:

- Fix the typo of automatic generating (such as `eip`, `vip`), and compatible with the old version (ucloud#6)
- Fix object schema class to object (such as `unet` schema) (ucloud#6)

improve documentation and http transport (ucloud#5)

ENHANCEMENT:

- Improve documentation: add response fields and models to service documentation (ucloud#5)

BUGFIX:

- Fix transport keywork arguments has no-effected error, add user-agent to default headers (ucloud#5)

compitable for python2 migration (ucloud#4)

ENHANCEMENT:

- Provide static code analysis tools with ast transformer to sync python 3 sdk implementation to python 2 (ucloud#4)
- Improve validation error message (ucloud#4)
- Add client-level logger (ucloud#4)

initial services