Release 0.8.5

[passsy]

@StefMa please merge and try to publish the release from master. If it doesn't work we revert #b1719d4 and I'll publish it as usual.

Version 0.8.5 12.10.17

Summary

Mostly a maintenance release improving documentation, adding tests and cleaning up the repository.

Highlight: The test package is now deprecated and all functionality was moved into the thirtyinch artifact.

Thanks for external contributors:
@baltuky @vpondala

Public changes

• Pull 115 New: Update dependencies (support lib 26.0.0, target- and compileSdkVersion 26 and other minor updates)
• Pull 120 New: TiPresenter#test() returns a TiTestPresenter with helper methods for unit testing. Replaces TiPresenterInstructor and deprecates the test artifact.
• Pull 126 Fix: TiPresenter#test() documentation, thx @baltuky

Internal changes

• Pull 99 Fix: remove javadoc warnings
• Pull 103 New: Improved RELEASE.md instructions
• Pull 105 New: Deprecate internal DelegatedTiActivity#isActivityChangingConfigurations which turned out as not required to handle config changes correctly. Simplifies internal logic
• Pull 112 New: Update to gradlew 4.1 allowing development with Android Studio 3.0
• Pull 113 New: Test for LifecycleObserver cleanup
• Pull 114 New: Tests for internal OneTimeRemovable
• Pull 117 New: internal PresenterScope tests
• Pull 121 New: Replace all Hamcrest assertions with AssertJ, thx @vpondala
• Pull 123 New: Add codestyle to project and reformat all sources according to this. Reduces diffs for external contributors
• Pull 127 New: Additional tests for
  TiTestPresenter