* Support full GitHub app authentication
Refactor GithubIntegration class and add test case for app authentication
Add permissions and repository properties in InstallationAuthorization
Set JWT_EXPIRY=60 by default in GithubIntegration constructor
* Modify existing testcases for GithubIntegration as per the framework and add missing tests
* Provide installation ID for creating the access token instead of getting the first installation
* Add optional permissions support for installation access token
* Add lock around app authentication
* Keep compatibility for importing GithubIntegration from MainClass
* Group app authentication parameters in a class
Co-authored-by: Malik Ammar Akbar <malikammar.akbar@pfizer.com>
Co-authored-by: Enrico Minack <github@enrico.minack.dev>
With the Python 2.7 deadline fast approaching, modernize the codebase
making use of the modernize module to switch to using six, as well as
other upcoming features, such as absolute imports . Stop using 2to3
for Travis, yay!
