Adjusted .gitignore to ignore generated IntelliJ IDEA files
Added Jackson mix-in class for PostStatus
Converted to new submodule-free Gradle build

Upgraded to Gradle 1.3 and latest DocBook reference plugin.
Replaced dependency on spring-social-test with spring-test-mvc
Rmoved unnecessary include statement
Set OAuth2Template to use parameter-based client authentication
Merge pull request #8 from isharamet/master

Convert to submodule-free build and update to depend on 1.1.0.M1