Clean jQuery data in callRemoveHooks

Otherwise handlers never get removed and we leak memory
3.8.2
Merge branch 'atom-future-proof'

Conflicts:
	package.json
	src/space-pen.coffee
Refer to 3.x branch at the top of the README
Blow up when trying to use tooltips
Blow up when triggering commands with a colon
Throw errors on subscribe and command
Fix link
Use the command registry for trigger events