Initial attempt at polling thread in ZPlayer
Updated Readme.md with 'Milestones'
[For Testing] Next song functionality, press Right arrow

Should be implemented in Now Playing class later
Framework for loading playlists
Zune Playlist loading
Updated Playlist with add from dir/file

Additional CTITS improvements, e.g. folder picker that doesn't suck.
NextSong property no longer has side effects
Moved next song out of the engine (BUGGED)

Also added events to player and added playback status
Fixed bug from commit b0fe9ab

Should probably take a closer at locking in other places where necessary
ConsoleTITS: eat available input to prevent queueing of commands
Added current track position
Added pausing/resuming

Breaks next song, though.
This loop condition needs to change. Fixes #5
Added polling thread warning
Added callbacks in favor of polling. Closes #3
Merge pull request #6 from horsedrowner/Threaded-ZPlayer

Primary engine implementation