modified the query methods to support groups as well as nested field hashes/objects.
Modified the update methods to be able to share to a group
merged in master
added nested fields back
Removed commented out line
added specs and tweaked code based on feedback
Merge branch 'master' of github.com:aorielly/linkedin
removed duplicate checks in build_field_params
renaming to match the other shares
Merge pull request #190 from aorielly/master

Added the ability to post to groups and added nested fields parsing