Add explicit dependency for spring web.  The version must be set to
match the version provided by Alfresco.
Change version of spring social to 1.0.0.RC1 (back rev).   It must match
the version provided by Alfresco. This version also depends on Spring
3.0.5.  This requires code level changes:
-HeaderAddingInterceptor is no longer needed. (Kept for when we can
revert spring-social versio change.)
-SalesforeTemplate: remove override annotation from
configureRestTemplate method; modify getJsonConverter to create
MappingJacksonMessageConverter instead of pulling it from parent class.
-ChatterTemplate: We can no longer use interceptors to add
X-Chatter-Entity-Encoding header.  This must be just on set up of
individual calls.