Update Android Built Tools and Play Services Dependencies
Merge pull request #124 from segmentio/prateek/updates

Update Android Build Tools and Play Services Dependencies
Dont wrap existing Map
Add Kahuna Integration

This reverts commit c3655b5603424c777ed99a22fa2c430f2846b173.

Conflicts:
	build.gradle
Merge pull request #125 from segmentio/prateek/kahuna-push-test

Add Kahuna Integration
Update Changelog
[gradle-release-task] prepare release 2.4.3
[gradle-release-task] prepare for next development iteration
Update Link for Javadocs
Consume entire keys to verify validity
Update Javadocs for Java 8 doclint
Build Matrix for Java Versions
Update Gradle Wrapper
Update Tests
Remove JDK 6
Merge pull request #127 from segmentio/prateek/matrix

Update tests to run on Java 7
Exclude dependencies provided by Android
Merge pull request #129 from segmentio/prateek/exclude-provided-dependencies

Exclude dependencies provided by Android
Use Travis CI Android Worker
Enable logging for CI builds