Incorrect type in contacts

Handle when people put an array in the contacts for client registration.

Closes #689.
More descriptive error for failed image
If share is a post activity, share the object
Merge branch 'master' of github.com:e14n/pump.io
Better handling of shares
Skip join of non-group
Explicitly likes and faves have recipients same as original post
Check for duplicates better

These changes check better for duplicates and for non-local groups.

Conflicts:
	bin/pump-import-collection
Add underscore-contrib
Localize followers URL
Don't cause an error if there is no object type when creating content
Just use the followers.url property if it exists
Merge remote-tracking branch 'upstream/master' into pump.jpope.org