Merge remote-tracking branch 'origin/master' into alee/fix-267-evaluatejobmanager
Fix #493, make insert cell menu a splic UI
Fix an issue about cancelling evaluation in evaluatejobmanager
Merge branch 'alee/fix-267-evaluatejobmanager' into v0.57
Fix #498, do not show cell stats when notebook is locked
Make the notebook loading spinner white
Merge pull request #499 from twosigma/alee/fix-498

Fix #498, do not show cell stats when notebook is locked
Move notebook cell operations from newcellmenu directive to notebookcellmodelmanager
Move some style for new cell button  menu so they are used by the big new cell menu bottons(at the beginning and end of notebook) too
Revert a4a8c06, make Evaluators menu back as top level menu as there is no support of multiple submenu levels
Merge branch 'v0.57' of https://github.com/twosigma/beaker-notebook into v0.57
Merge remote-tracking branch 'origin/alee/fix-insert-cell-btn' into v0.57
Make insertcell menu not shown when loading notebook
Mark notebook as inserted when inserting a cell
Fix an error in e198371, hide insertcell menu properly when loading notebook
Fix duplicate cell menu entries issue by emptying the container during reset
Remove goto button
Update pioneer for tests
Update plugin manager style
make bullet on "From URL" button invisible