Merge pull request #80 from habuma/master

SOCIALFB-112: Ability to send event invitations.
Updated Reference, WorkEntry, and EducationEntry to be Serializable
Merge pull request #87 from habuma/master

Add debug level logging of error returned from Facebook.
Merge pull request #88 from habuma/master

Update to Jackson 2
Merge pull request #85 from jdappel/SOCIALFB-111

Updated Reference, WorkEntry, and EducationEntry to be Serializable