admin lesson resource in place.
added jquery-ui sortable
ignore development uploads
fixed merge conflict
ui update for courses in admin section
admin media resource
installed jquery jplayer for playing audio files
only load specific bootstrap js files
added chosen for fancy dropdowns; before save callbacks on media to take into account media type.
email notification sent when provider approves group membership.
adding new files
set counter cache for media on lessons; added media type to admin lesson show page