Added readme and license.
Updated readme.
Fix potential NPE crash.
Move last.fm api key to local properties.
Upgraded gradle, build tools, etc.
Updated build tools script.
Updated build scripts and dependencies. Migrated from Crashlytics to Fabric.
Update to Muzei API 2.0.
Set default ApiPeriod to Overall.
Release 1.0.3.
Merge branch 'release/1.0.3'