Send errors to stderr instead of stdout, so they don't conflict with regular output
Don't case sensitively match color hex strings (i.e. allow FFFFFF as a color next to ffffff)
Merge pull request #13 from sgielen/stderr

Use STDERR for errors
Merge pull request #14 from sgielen/caseinsensitivity

Don't case sensitively match color hex strings (i.e. allow FFFFFF as a c...
Experimental steps per beat support