Merge pull request #130 from srgpqt/master

fix improper usage of strong parameters in FiltersController
bring back moderation_reason for moderators
use Rails.env.development?
mobile story list: make comment links easier to click on
mobile story view: align things a bit better, shorter markdown help label
avoid leaking object ids in form_fors
fix story pagination and caching for logged-out users

use a file store so each unicorn process can share the same set of
files (using redis would probably be cleaner)

put page number into how hash when creating the cache key
Comment: alpha sort methods, no functional changes
Story: alpha sort methods, no functional changes
User: move "new account" age into constant
spacing nit
set maximum time during which comments and stories can be downvoted

always allow a user to "unvote" if they're previously downvoted, but
after a certain number of days, don't accept new downvotes

there isn't really any benefit in downvoting old stuff that is
already off the front pages or on a dead comment thread, other than
to maliciously strip karma for particular users
add a story-only mailing list mode

closes #131
invitation requests: use a proper form_for, highlight errors
invitation requests: allow moderators to delete confirmed requests
invitation requests: show confirmed e-mails to moderators
messages: implement batch-delete function

closes #119
fix fallout from mailing_list_enabled -> mailing_list_mode
Fix typo Invitiation -> Invitation
Merge pull request #134 from rvoicilas/master

Fix typo Invitiation -> Invitation