added path to PCC macros (now in OPL) to defaults.conf
added booktabs, tabularx, and colortbl to LaTeX preamble
added packages to hard copy production
Merge pull request #449 from apizer/bugfix_master

Replace line 48 of /opt/webwork/webwork2/lib/WeBWorK/File/Classlist.pm

I tested this by importing a classlist file with extra whitespace.  The fix works as intended.
This commit adds a message to the Course Admin page when there are upgrades available for WeBWorK.

-  It checks for upgrades for WeBWorK and PG
-  It checks to see if your OPL database is out of date
-  It can be configured to use any set up of remotes/branches.
Bugtesting Commit
Made commit comparing a little more reobust.
another bugtest commit
Reverting bugtest
bugtest
Merge remote-tracking branch 'origin/upgrade-notifier' into upgrade-notifier
Refactored how git checks for being up to date.
Update README
Merge branch 'upgrade-notifier' of https://github.com/goehle/webwork2 into upgrade-notifier
Cleaning up unintended changes and getting support for math3.
Revert bugtest
Revert bugtest
Merge branch 'upgrade-notifier' of https://github.com/goehle/webwork2 into upgrade-notifier
Added ability to turn off system by setting any of the remote/branch variables to be empty

Added check to see if there is a new version tag and update the message
bugtest