Release 2.1.0

• Make GTF parsing more robust
• Better error reporting of bad gene name in GTF
• Sample alignment script bug fixes
• In wrapper scripts, don't set TMPDIR environment variable to a directory that doesn't exist
• CollapseTagWithContext adaptive edit distance now does a better job of selecting the proper edit distance threshold to use for a few rare edge cases
• Respect TMPDIR environment variable in unit tests, and better unit test cleanup