Added short options to mido-play.
Tests were run with Python 3 even if Python 2 failed.
Merge branch 'develop' of github.com:olemb/mido into develop
Added a test.
Merge pull request #9 from rbinkys/develop

Develop
Fixed a couple of errors in the last commit.
Merge pull request #10 from rbinkys/develop

Merged the last meta messages from Rapolas.
Fixed a meta message attribute that had the wrong name.
run_tests.py now returns the correct return code.
Moved print_tracks() up a bit.
Changed key_signature defaults to C major.
Made sequencer_specific data a tuple (to make it behave list sysex message.)
Used decorator for MidiFile.length property.
It turns out meta message payloads can be > 255 bytes. This is now supported.
The leading u is no longer removed from MidiFile and MidiTrack names when
they are displayed.
Gave time_signature message more meaningful defaults, and also fixed a typo.
Removed a comment.
ticks_per_beat can now be passed to MidiFile() and now defaults to 480.
Moved copy() to BaseMessage.
Removed a method that was no longer needed.