Add gradlew.
Use gradlew instead of downloading gradle distribution.
Upgrade to android plugin to 0.7.
adb wait-for-device instead a script
update to android build tool 0.8
Merge pull request #1 from dagezi/android_built_tool_0_8

update to android build tool 0.8
fix Icon URL and anchor destination
fetch build-tools via android command
Merge pull request #2 from dagezi/fetchBuildTools

fetch build-tools via android command
Misc refactoring
Remove unused SDK
Fix comment
Reorder SDK installation.
upgrade platform to 19
Merge pull request #3 from dagezi/removeUnusedSdk

Remove unused sdk
Merge pull request #12 from dagezi/master

Refactoring and update android plugin