Remove excess code.

Removed code from this controller that actually resides in
app/models/student.rb that will fix a problem with duplicates
this was also fixed in the pie-chart branch
Add link to view all attendences next to the 'Im here' link
Code cleanup, remove unneeded commented lines
Add code to list all attendences or just that of one student

Updated the attendences page to be just a list of the past and present
attendance recorings, also moved the page that a student is directed to
after checking in to the students index page
FIX corrected page not changing to only the selected student
Table layout cleanup wide rows
Table layout cleanup of all students added spacing