Merge pull request #37 from jtsay362/master

Fix bug handling OAuth2 access grant request.
Removed Google.applyAuthorization() method. Use getAccessToken() to
integrate with other Java libraries.
Rephrased "profile" to "details" or "info" to prevent confusion between
user info details and Google+ profile.
More profile->info changes
Typo fix
Deserialization fix
Switched to Gradle and added Docbook reference documentation.
Added method for downloading a file from Google Drive.
Removed Google.applyAuthorization() method. Use getAccessToken() to
integrate with other Java libraries.
Rephrased "profile" to "details" or "info" to prevent confusion between
user info details and Google+ profile.
Reference documentation update
Upgrade to Spring Social 1.1.0.M4
Updated changelog
Added some tests
Simplified query string building
Added Tasks API tests
Refactored Person classes and added URL label
Added Tasks and G+ tests
Added G+ tests
Fixed Maven repository URL