Fix bug with removeButton when splicing right controls
Sharer
Fix margin of first hub-btn-link on left/right footer areas
Remove margin-top from twitter intent btn icons
Fix bottom padding
Fix left whitespace of first tweet intent btn
Check if content is shareable
Fix bug with missing default for undefined opts
Register contentShare.hub callback via view#delegateEvents by way of events mapping
Fix bug with isContentShareable
Fix vertical alignment of first hub-btn-link button
Rename contentShare.hub event to shareContent.hub
Add test for shareContent.hub callback