Add copy namespace

[cjaoude]

This is nice thanks. Adding a 'copy namespace' would compliment this package, save everyone lots of time. I'm surprised can't find a current version of this in package control.

https://packagecontrol.io/packages/Copy%20PHP%20Namespace

super annoying to have to do it manually. eg. So the file is 'App\Foo\FooFactory', and 'copy namespace' would copy that to the clipboard.