ignore sublime files
add unique key for subscriptions (check, user, method)
only process checks once per cycle, not once per subscription per cycle
get correct count for alerts - makes pagination work on homepage
add newline to processor debug statement
handle null values in check processing
skip processing of checks with missing or null values
use mutex for processing
order alerts on homepage by timestamp (latest first)
Merge branch 'master' of github.com:matthew-lucidchart/Graphite-Tattle

This set of commits solves problems encountered with larger installations, including:
- Add unique subscription key
- handle null values more intelligently
- Order alerts on homepage by timestamp
- Process checks once per cycle, not once per subscription per cycle