Fix subgraph carving using bad _ids

We weren't updating the "_vertexId" when copying graphs, which really
confused how subgraph carving happens. Since we our fork of titan-es
preserves _ids between Titan and ES, we can just use ES's "_id" field
and get rid of "_vertexId".
Merge pull request #161 from erickt/master

fix running jung from cli
Merge pull request #149 from erickt/fix-carving

Fix subgraph carving using bad _ids
Update location of git repo directory on backend commit
UI: Move branch/data messages to project canvas
UI: Enable all branches to dropdown on hover
UI: Update polling for status of history server
UI: Cleanup hanging log statement
Merge pull request #162 from kylef-lab41/pr-showhistory

Final changes to show history server, as well as branch/data messages
UI: Move query for branches into pollBranches function
UI: Branch show indicator and repoll on create/delete/commit/switch
UI: Fix branchName reference for branch message
Merge pull request #163 from kylef-lab41/pr-branchrepoll

Branch show indicator and repoll on create/delete/commit/switch
UI: Fix panel toggle buttons to avoid multiple click handlers
UI: Make intro tour wait while project is being created
Merge pull request #164 from kylef-lab41/pr-fixverticaltoggle

UI: Fix panel toggle buttons to avoid multiple click handlers
UI: Use dynamic id for file import button for tour compatability
UI: Update selectors for intro tour (to work on Firefox)
UI: Add test dataset link to main page (instead of just intro tour)
Merge pull request #165 from kylef-lab41/pr-fixtourprojectcreate

UI: Make intro tour wait while project is being created