order schools on test score import page by name
ensure all data keys and test names are lowercase to prevent duplicates in test score import
added backtrace to import error
removed backtrace from import row error but added more explanatory error messages
added more detail to import error messages
ordered failed import jobs by most recent first
made import row error clearer
added statement to check whether when sorting a test score column that is also the test name that the data is leveled
added unknown to the list of valid classes in the level breaker singularizer
test grouper now checks for nil and empty strings to substitute 'Unknown'
upcased test name on student show page
check for null and empty values
add teacher and teacher sorting on test scores index
improved usability and security of ordering
order by level
downcased unknown to be compatible with the css styles
reordered order statements so test_scores with a NULL or ''  value would be placed at the bottom
duped levels because reverse! was causing errors every other load
changed TestScore::LEVELS to TestScore.levels so the array cannot be mutated
some helper methods are required by students and test_scores controller, extracted them into a module