fix parse midi bug

[vzex]

midi event may be ignored in the file.need to be processed,just in
switch mType {
...
...
default:
{
//this place to deal with
}
}

[afandian]

Thanks for this! Lots of changes, I will need to take some time reading them. Are you using this library? What for?

[vzex]

Yeah, I'm using this library for learning the midi file format.I think this lib is simple and easy to understand, and also easy to do some experiments.