Added assertions about differences between number of submissions allocated amongst graders.
Added assertions about differences between number of submissions allocated amongst graders.

CodeGrade/bottlenose,blerner/bottlenose,CodeGrade/bottlenose,blerner/bottlenose,CodeGrade/bottlenose,blerner/bottlenose,CodeGrade/bottlenose,CodeGrade/bottlenose,blerner/bottlenose,blerner/bottlenose,CodeGrade/bottlenose,CodeGrade/bottlenose,blerner/bottlenose,blerner/bottlenose