first version of gradle build files
fix license
it compiles!
library can be built as aar using gradle; sample not ready yet
gradle structure
updates AndroidManifest version
exclude sample project from gradle build
Merge branch 'master' into feature/gradle

Conflicts:
	library/pom.xml
	library/src/main/AndroidManifest.xml
updates gradle plugin to 0.5.6
updates .gitignore
updates project.properties
gradle setup
fixes signingConfigs
adds min and target sdk versions
introduces SigningProperties to build.gradle
Merge branch 'feature/gradle' into develop
update README and gitignore