Automatically detect relative directory position

Replace the manual `base_path` variable with the solution proposed in SO
answer http://stackoverflow.com/a/14254928/143383.
Move course info out of main config file
Remove unnecessary template file
Update to Bootstrap 3.1.1
Fix Javascript links
Rearrange HTML header
Don't include course/instructor info on every page
Use default layout by default
Add collections for notes and assignments
Rework default layout

Now uses a static navbar
Remove tutorial content from README
Add layouts for collections
Make examples
Update README