Twitter Conversion Tracking on Home Page

Twitter Conversion Tracking on Home Page
NEW: Twitter Conversion Pixel for Home Page

Twitter Conversion Pixel for Home Page *This version tested in dev
environment, ignore other pull request*
fix #534 customers deleted-from-Stripe were causing reports:usage task to fail
use progressbar gem that search task uses
more re #593: workaround case where collection is AWOL
pretty up the /admin/total_usage page
cache pua totals to help speed up pagination (TODO consider caching these via task+sql)
with cached totals in 2e8f3a3 increase page size for visibility
make Stripe cache configurable
increase cache ttl for totals
why would this be such a small fixed width? looks funny
activeadmin gem, for pretty, easy reporting ui
superadmin: add organizations, flesh out user page
standardize user link format
resurrect sortable column for custom display blocks
add collection and item to superadmin/ ui; add usage methods per-org and per-collection #548
add collections to user profile page
include child items count
add real dashboard
override superadmin/ default font size, tweek user stats display