Removed unnecessary @.'s

Since CoffeeScript automatically converts @ to this. when immediately followed by a character.
Update AUTHORS.md
Remove empty helpers
someone accidentally a word
Merge pull request #34 from mharen/master

Fix minor type in README.md (someone accidentally a word)
Merge pull request #22 from sandal/patch-1

Fix typo in AUTHORS.md
Don't enable Cache-Control if the site has restricted access.
Oops, that should be 1.minute
Use double quotes in image uploads instead of single quotes. Our sanitizer seems to
hate single quotes.
Support for replacing Site Message content with keys specific to a multisite.
Temporary Nuclear option on topic titles - disallow non ascii characters so we
can stay on top of the trolls. This is meant to be replaced soon with a more
permissive and safe method of sanitizing.
Merge pull request #33 from sebasoga/remove_empty_helpers

Remove empty helpers
Merge pull request #7 from mutewinter/fix_at_dot

Removed unnecessary @.'s