(Bug 4196) New comments by replying to comment notifications

* Refactors the existing LJ::Emailpost into
  DW::EmailPost/DW::EmailPost::Base/DW::EmailPost::Entry/DW::EmailPost::Comment

* DW::EmailPost::Entry works by providing a PIN, same as before

* DW::EmailPost::Comment works by having a one-time auth per
  comment/comment thread, not time-limited, automatically generated by
  DW

* comment notification email has a Reply-To header, and additional
  instructions. Instead of going through the comment form, simply
  "reply" via the email client.
Merge pull request #346 from afuna/reply-to-comment-email-bug4196

(Bug 4196) New comments by replying to comment notifications
Bug 5016 - Motion: preview pic doesn't load & style doesn't display correctly in Customize
http://bugs.dwscoalition.org/show_bug.cgi?id=5016
-- Update names
Merge pull request #351 from ninetyd/bug5016/motion_newname

Bug 5016 - Motion: preview pic doesn't load & style doesn't display corr...