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 pull request corresponds to the read_whole_problem_file pull request for PG.  It also has bugfixes for a corner case PGProblemEditor button.
Changed depreciated startform endform to start_form and end_form
Missed some endforms
Merge pull request #465 from goehle/readbug

Fixing read_whole_problem_file bug (develop)