Image url

Created a field in the database, associated forms and views, spec tests, and validator in lib/validators that allow a user to include an image with their project description by linking to a file hosted on a whitelisted website.

https://www.pivotaltracker.com/story/show/80235250
line 3, it appears to have an additional 4 spaces of indentation. In fact it could just be a tab character, could you replace it with spaces?