Converted unit tests to rspec for grade model
Corrected style errors
IntelliJ lied when it said it broke the lines
More style fixes for group tests
Removed old grade_entry_student test as there is an rspec one
Merge branch 'rspec' of https://github.com/SoftwareDev/Markus into rspec-grade

Conflicts:
	test/unit/grade_entry_student_test.rb