Allow custom file extension for Rails downloads
Add support for custom mime type in Rails downloads
Merge pull request #47 from trappist/master

Allow custom filename for Rails downloads
Bump supported rails version to 3.2.8
Bump gem patch version for customisable file extensions
Lock file update
Ensure comma works with latest rails 3.2.11
Confirm 3.2.12 works
3.1.12 added to appraisals
Remove .rvmrc