Only specified part is not muted

<part>o - mute everything except part
o - unmute everything
<part>m - mute only the specified part
m - mute everything
Mute All UnMute All in part view

shift+m for mute all
shift+o for unmute all
Fix g keystroke
Merge pull request #19 from chriserin/only-part-is-not-muted

Only part is not muted
Use container to access audio context
More explicit store configuration
Upload songs to a server
Extract store configuration helper
Break remote serializer into its own file
better 404s
list remote songs
Load remote songs into local store

This doesn't feel very Embery, but it's expedient.
And just like that it now works on teh phonez
upgrade lineman
Stub out the song index xhr
delete song cascades
update readme
sharing notes