add default constraints yaml file
add initial default constraint parsing
check for and add default constraints in globs
make added constraints box display default constraints
add course constraint parsing/addition
remove debugging print statement
remove debugging comments, add docstrings to helper functions
add tests for default constraints
resolve test output bug, remove unnecessary variables in globs
change invalid time in example course_before_time constraint
Merge pull request #58 from donnell74/default_constraints

Default constraints