* Target Sdk Version 26
* Add Adaptive Icon For API 26+
* Update travis to compile against API 26
* Move SVG files to art/launcher/v26/ per CR
* Scale logo to 83%
* Update buildToolsVersion to 26.0.2
* Update travis build-tools to 26.0.2
* Added dependency on assembleFullDebug before running unit tests.
Apparently assembleFullDebugUnitTest does not include
the sourceset for fullDebug as defined in app/build.gradle