fix promises on view.js
rcloud_github_handler posts error and reraises. catch the rcloud exception when loading notebook downstream, to post a disconnection notice with the option to log in. Closes #276
Merge branch 'enhancement-276' into develop
catch async exceptions that might come out of with_progress
disables buttons when in readonly mode. Closes #285
Merge branch 'bugfix-285' into develop
upgrade jquery ui to 1.10.4
do not enable jquery ui tabs that aren't there

(the current custom build does not include them)
reorder cells by dragging and dropping

using jquery ui "sortables"
closes #284

pretty elegant... the only thing that was messy was providing a
way to skip firing events from notebook model events, since we don't
want the reactions that create and destroy visual elements (cell views)
and need a higher-level "moved" event over "remove" and "add"

jquery.ui is pretty freaking amazing
artifacts
Merge branch 'feature/reorder-cells' into develop

Conflicts:
	htdocs/js/rcloud_bundle.min.js
Merge branch 'develop' of https://github.com/att/rcloud into develop

Conflicts:
	htdocs/js/rcloud_bundle.min.js
Merge branch 'develop' into feature-scratchpad

Conflicts:
	htdocs/js/rcloud_bundle.min.js