Removes sorting links from stats_table
Merge branch 'master' into caching
Caches lots of calls, especially on the leaderboard.

Includes bestByTime, sorted_sleepers, totalSleep, and decayStats.
Merge branch 'master' of github.com:benjaminjkraft/zscore
Merge branch 'caching' of github.com:benjaminjkraft/zscore into caching
Merge branch 'caching'
Adds caching of header and footer.
Adds ./manage.py clearcache
Fix header cache.
Only cache full leaderboard, not for groups
Fix totalSleep cache for groups.
Fix for caching on groups totalSleep.
Adds consistent2 metric, changes how missing sleep is dealt with, prunes some metrics from being displayed
Merge branch 'master' of github.com:sleepers-anonymous/zscore
Mild change of wording: invite members instead of adding members
Start of wakeup-time advice.
Merge branch 'master' into leaderboard