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
Fix incorrectly applied `Gravity` on Crouton view

- The Gravity attribute is currently applied on the TextView inside the contentView, a RelativeLayout. The TextView is the same height as the RelativeLayout, so it appears as though vertical Gravity settings (CENTER, CENTER_VERTICAL) aren't being applied correctly
- I changed it so that the RelativeLayout fills the croutonView, and also adds a layout rule based on the Gravity attribute. Now the RelativeLayout and FrameLayout are the same dimensions, but the TextView is full width, and wrap content for height, so it's able to use the RL rules for vertical positioning and as before with horizontal positioning.
- The fix only works with CENTER, CENTER_HORIZONTAL, and CENTER_VERTICAL; it hasn't been tested with RIGHT, LEFT etc.
Update crouton_demo.xml

Add an in inner LinearLayout.
updates .gitignore
updates pull request section of README
updates gradle plugin to 0.5.6
updates .gitignore
updates project.properties
Updated android-maven-plugin to newer version.

This was necessary since aapt has moved in recent SDK versions and the older plugin couldn't deal with that.
gradle setup
fixes signingConfigs
adds min and target sdk versions
introduces SigningProperties to build.gradle