Merge pull request #908 from mmcguinn/hotfix

-Switched saved vis to use the new session route for verifying a user is logged in.
Parens are sometimes necessary
Merge pull request #910 from jdalphon/jd_issue875

Parens are sometimes necessary
#911
Merge pull request #912 from jdalphon/fixCache

Working around a known chrome bug
-Fixed coffeescript source line reporting.
-Added notice below heatmap radius when it is forced to be changed.
Merge pull request #914 from mmcguinn/hmfix

Heatmap
-Fixed strange projection issue for saved vis.