Moved compileSdkVersion and buildToolsVersion on top level build.gradle
Updated dependency to com.android.support:support-v4:19.1.+ and changed compileSdkVersion/buildToolsVersion references.
Merge pull request #96 from gabrielemariotti/master

Updated library dependency to com.android.support:support-v4:19.1.
merged with 8dba11b99d848716f5cfa279f4ec7100d66402d0