fixed initial database migration
added tags and db migrations
tag admin update
fixed field lengths for tags
roadmaps have tags
browsing view
improvements to browsing view
three column concept lists
small browsing interface changes
use GLM for time estimates
only use core resources for time estimates
displaying time estimates to admin user
admin user can update learning times
use newer version of NumPy
Merge branch 'master' into time_estimates
only display finished concepts in browsing view
removed cserved_communicator
removed unnecessary makefile command
refactoring deprecated content server
CG instead of BFGS for time estimates