complete simplifying sharing story

[briandunn]

Right now sharing songs is wonky:

• go to song list
• push the share button
• copy the url from the new song that appears

I'd like it to be more like:

• push the share button from the song or the list
• the song show url can now be used from anywhere (either copy it from the url bar on song show, or grab it from the song link via 'copy link location')

shortest way to that end:

[ ] share button on song page
[ ] use the same id on client as server, so the url can be shared.
[ ] don't show remote songs that are already loaded in local storage

This doesn't really deal well with conflicts, IE someone saves over the song you shared.

it would be nice if

• sign in to share
• only original author can overwrite, others must "fork"