redis deployment
installing celery prereq for ccelery-push branch of api
Merge pull request #267 from OpenTreeOfLife/get-version-history

Get version history (UI)
Merge pull request #249 from OpenTreeOfLife/api-on-celery

Api on celery
Merge branch 'master' into highlight-nodes-in-tree-viewer
Richer labeling of tree nodes and node-menu popups.