Use filesystem storage for non-production

* Add public/uploads to gitignore
* Also add newline to the end of gitignore, as Unix editors like
Switch the paperclip config to the environment configs
Initial attempt to get tests passing, thanks @vevix
Fix URL and Path for configs, remove hardcoded (kinda) URL
Make Manga.poster_image_thumb use paperclip url method in dev
Merge pull request #30 from NuckChorris/development-off-s3

Use :filesystem for Paperclip in Development config