removed max introns
added test data for find_A5SS_test.py
added tests for find_A5SS.py
cleaned up PEP8 violations

corrected a script description
added a gene with no retained introns
corrected a description

changed TestFindSE to TestFindRI
corrected output

cleaned up PEP8 violations
added tests for find_A3SS.py

added test data for find_A3SS.py