do not create global variables
support arbitrary attachments
display correct template when attachment or image
post process attachments
don't track via AJAX when clicking on local attachments
refactor optimized_image a bit
update nginx.sample.conf to take attachmetns into account
update back-end specs
update front-end specs
Update typo in documentation
Update HEROKU.md

heroku has changed its default ruby version to 2.0.0 , now no need to write ruby version on top the of Gemfile. check https://blog.heroku.com/archives/2013/6/17/ruby-2-default-new-aps
Merge pull request #1179 from iamjarvo/1176_update_install_email_guide

Update typo in documentation
Merge pull request #1177 from ZogStriP/attachments

Attachments
FIX: deleted_by wasn't showing up on refresh
FIX: Topic Status Icons had weird margins after font awesome update
Merge branch 'master' of https://github.com/discourse/discourse