Merge pull request #11 from asceth/master

Fix app error when request_params on filter creation are nil
Last occurence in distance of time in words. Fixes #13.
Default digest time to EST/EDT. Sort of fixes #12.
Add hover text to show absolute time.
Avoid use of endsWith since it is relatively new.
Filters index page looking better and more informative. Fixes #14.
Change order of tag, and change syntax to more cenventional.
Add other parameters to the filter index display.
Correct digest URL. Fixes #15.
return json for xhr request not a redirect