Added facebook library
Updated gradle to version 12
Added /build to .gitignore
Removed attributes from AndroidManifest set from gradle
Auto formatted code
Removed unneccessary permission READ_PHONE_STATE
Refactored adding more constants and getting rid of some unnecessary lines
Refactored changes suggested by lint
Extracted constants and did some refactoring
Changed to API level 8
Added app-url-scheme data tag
Refactored for better clarity