Update for SDK 1.13
Merge pull request #5 from freaktechnik/master

Update unload+ to work with SDK 1.13
v2.0 unload+ now runs unloaders when the associated window is closed, and window-watcher module is no longer supported
Merge branch 'master' of github.com:voldsoftware/vold-utils-jplib

Conflicts:
	lib/unload+.js