Add basic cancan stuff (WARNING: VERY UNSTABLE)

You can literally do nothing, so don't merge this anywhere or try
anything with it.
Cancan works now! Yay!
A prettier way to do something that I came across randomly that has
nothing to do with cancan.
Make some sidebars.

@sammidysam @four04 what should we put in the left sidebar?
Make fix suggested in comments on bd21d83d52c296e3bceb159b38a190d2f44118c5
Space
added favicon; you're welcome
Make some sidebars.
Space
Show period of class on sidebar
Merge branch 'sidebars' of github.com:kotct/docket into sidebars

My tree is happy now

Conflicts:
	app/views/layouts/application.html.erb
do magical float-y thing

See comments on b9ebdb2650489d14925a77f9ef212c7479eb2da5
Make the list of users in a classroom be prettier

This adds .badge and .link-no-underline to the members, making them more separated.
Fix problem with relevant_date being undefined

This is a quick and messy fix, since the rewrite in v0.2.0 will not need
this function.
Merge branch 'master' into fixes
Move relevant_date method to in private block
DRY: include ApplicationHelper in docket controller
This will allow the function to not be defined twice.
Sort things, fixes #18
Fix meta tag so it actually works on mobile
Merge branch 'master' into sidebars