fixed spacing and removed `try_files`

Fixed a few spacing issues and removed `try_files` from comment here: https://github.com/jquery/jquery/pull/1410/files#r7237197
Update jquery.dev.conf
Update jquery.dev.conf
Updated jquery.dev.conf for autoindex feature

See https://github.com/jquery/jquery/pull/1410/files#r7237195 for more information.
Added alternative options back

See comment here: https://github.com/jquery/jquery/pull/1410/files#r7238762
Reduced RAM needed for Vagrant

Bumped it down from 512 to 256. Should be efficient enough at this setting.
Merge pull request #1 from carldanley/vagrant

Fixed multiple issues in Vagrant configs