[Fix bug 1038055] Fix authentication login_failure() definition.

* Implement error handling.
* Fix login_failure() TypeError triggered by BrowserIDException on BrowserID post().
Merge pull request #1035 from johngian/fix-1038055

[Fix bug 1038055] Fix authentication login_failure() definition.
[bug 1033993] Implement new vouching process in /invite page.
[fix bug 997460] Auto-vouch all attendees of the 2013 Summit.
Merge pull request #1032 from akatsoulas/997460

[fix bug 997460] Auto-vouch all attendees of the 2013 Summit.
initial map stuff
marker clusters have a more unified style
added custom map tiles generated from geo data
add geo data to groups view
copy-cat commit of sancus's "move data output to the view"
connected json to front-end map on groups page
copy-cat commit "added marker labels"
copy-cat commit "labels were sowing out overly-verbose text"
copy-cat commit "used profile object for labels"
gravatar icon used for single marker. very fancy
retina screen support for complete absurdity
added open street map attribution to visualization