update gradle build scripts to be consistent
cleanup AndroidManifest files
update gitignore to better support AndroidStudio
cleanup all gitignore files
remove redundant iml file
Merge pull request #254 from RomanZhilich/cleanup-gitignore

update gitignore to better support AndroidStudio
return version info and sdk requirement to AndroidManifest files
Merge pull request #253 from RomanZhilich/master

update gradle build scripts to be consistent; cleanup AndroidManifest files
Merge branch 'master' into unity_exclude_fortumo

Conflicts:
	library/build.gradle
	samples/trivialdrive/build.gradle
	settings.gradle
Merge last dev.