Birthday Notification Alert, Saving Bug Fixes

Added a birthday notification that pops up for admin users when
birthdays of users are either the current day, the next day, or 7 days
out. Also added a fix for missing saves in three student experience
columns. Finally, fixed the calculation for Total Students to exclude
students who had 0 service learning hours.
Merge pull request #17 from jderocher/master

Birthday Notification Alert, Saving Bug Fixes