Compile with 27, Android Gradle plugin 3.0.0

[Jawnnypoo]

This changes the project to compile with Android 27, and use the Android Gradle 3.0 plugin, alongside the api instead of compile statements.

I went ahead and also removed the ParseStarter module, as it would crash on launch due to us having no sample server, and I think overall would just cause more confusion than good.

[codecov]

Codecov Report

Merging #760 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #760   +/-   ##
=========================================
  Coverage     53.38%   53.38%           
  Complexity     1746     1746           
=========================================
  Files           132      132           
  Lines         10286    10286           
  Branches       1427     1427           
=========================================
  Hits           5491     5491           
  Misses         4340     4340           
  Partials        455      455

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[natario1]

Cool. I agree with ripping out the starter project.