define new api functions to easy device customization
Merge branch 'master' into more_api

Conflicts:
	gradle-android-command-plugin/src/main/groovy/com/novoda/gradle/command/AndroidCommandPlugin.groovy
fix task registration
Merge branch 'master' into more_api

Conflicts:
	buildSrc/build.gradle
	gradle-android-command-plugin/src/main/groovy/com/novoda/gradle/command/AndroidCommandPlugin.groovy
	gradle/wrapper/gradle-wrapper.properties
	sample/build.gradle
use instance variable instead of method parameter
Groovier constructor.
Added Device class and more device properties.
Merge pull request #12 from novoda/more_api

Looks good to me, merging