Upgrade to Jackson 2. SOCIAL-362
Merge branch 'master' of github.com:habuma/spring-social-facebook

Conflicts:
	spring-social-facebook/src/main/java/org/springframework/social/facebook/api/impl/json/FacebookModule.java
	spring-social-facebook/src/main/java/org/springframework/social/facebook/api/impl/json/PostMixin.java