ignore releaseDate=0 in mp4 files
use mp4 genreType if necessary
Fix seg fault in run_cmd

parse_one was setting ret to part and then immediately freeing it before
returning.

Set it to xstrdup(part) instead.
Add cscope.files and TAGS to .gitignore
Rough in lp.h

A header for library plugins (of which DAAP will be one example. Since
I'd like to do DLNA later if I get DAAP to work, no reason not to
abstract it.
Add library plugins (generally) to Makefile
Rough in DAAP plugin

It's just a skeleton, for now.