Add a script that migrates the base layer names

Address #493
Update the script to use a bulk update
Update the json field so the GeoExplorer gets the correct title for
the base layers
Merge branch 'master' of github.com:opengeo/mapstory
Add sharethis on every page
topic change feedback, refs #513
Display first and last name if available refs #612
Fix settings reference in context_processors
Remove extraneous entries in social login installed apps
Use branded social login buttons
Add social sign-in to signup.html and login.html
Initial implementation of twitter card functionality
Add twitter card to mapinfo.html
fix reference to map
Add description tag to the open graph meta tags
initial incomplete work on grabbing name and email from external social services
Switch to pipeline based method for grabbing url
Merge pull request #627 from jj0hns0n/issue-347

Add description tag to the open graph meta tags
cleanup PR590, squash and add perm check, iss #504

thanks jj0hns0n
Continued work on grabbing avatars from external social services