Revert 7d6b5475f57d1126e92873708706e7c3ab715def for the paste plugin.

It introduced an accidental log statement that should never have been
committed, and which wasn't properly terminated.
General bits of the sprint specific fixes to copy plugin.
Add missing Pubsub dependency
Add copy button to toolbar.
Make copy plugin compatible with older jquery
Merge branch 'testing' into izak-copy-image-rewrite

Conflicts:
	src/plugins/oer/copy/lib/copy-plugin.coffee
	src/plugins/oer/copy/lib/copy-plugin.js
	src/plugins/oer/toolbar/lib/toolbar-plugin.coffee