Add front end features for demo day

In real life, this kind of a mixed-feature commit would never happen.
Fix Comments
Add Projects You've Funded to Home Page

When a user is logged in, projects to which they've donated are shown on
the home page, next to the list of their own projects.
fix hound comments
Add percentage display
Fix hound comments
fix hound comments
Show successful projects
Fix hound comments
Move new levels heading into levels if statement
Update donation levels page heading
Move progress bar to top of project page
Merge pull request #13 from liantics/lea-prep-for-demo-day

Add front end features for demo day