Add class for testing ordination utility functions

Added test for mean_and_std error handling.
Add shape mismatch test for corr
Add tests for invalid qual file
Add test for parse_qual(full_header=True)
Rewrite test_parse_qual

Shorter and more comprehensive test
Clean up strict tests, add better docstring to strict parameter
Add test for parse_fasta's label_to_name param
Add error-handling tests for factory module
Add tests for different types of phred offsets
Merge pull request #462 from ElBrogrammer/issue-458

increase code coverage (part 1 of N)