Adding mark all button with correct css. [axof: 179]
Functioning all button. [axof: 179]
Adding changing arrow on click. [axof: 179]
Fixing date function and helping Vince with expanded student list. [axof: 180]
Adding mark all present and absent functions. Show and hide students function. [axof: 179]
merging rachels stuff
Merge pull request #21 from deeger/markAll

Mark all