Android updates (gradle, build)

[ened]

V0.0.5: Various Android updates

[ened]

@ened ready for your review

[Aragur]

Would be nice if this would be merged soon :)
Builds are failing atm because build tools 25.3.3 got removed from the maven repositories...

> Could not resolve all artifacts for configuration ':screen:classpath'.
   > Could not find com.android.tools:common:25.3.3.
     Searched in the following locations:
       - https://jcenter.bintray.com/com/android/tools/common/25.3.3/common-25.3.3.pom
       - https://jcenter.bintray.com/com/android/tools/common/25.3.3/common-25.3.3.jar
       - https://maven.google.com/com/android/tools/common/25.3.3/common-25.3.3.pom
       - https://maven.google.com/com/android/tools/common/25.3.3/common-25.3.3.jar

[arranf]

@clovisnicolas I think you were meant to be @'ed above!

[ened]

For anyone interested, you can use my branch directly by adjusting your pubspec.yaml:

  screen:
    git:
      url: https://github.com/ened/flutter_screen.git
      ref: android-cleanup

[ened]

@clovisnicolas ready to merge & publish?

[clovisnicolas]

Hello, done, sorry for the delay