chore(ckeditor): Convert blockimagepaste plugin to AMD

@jdalsem This is what I meant. Is this what you tried? Any reason not to go this way?
Will look intro it next monday
Op 28 nov. 2014 23:12 schreef "Evan Winslow" <notifications@github.com>:

> In mod/ckeditor/views/default/js/elgg/ckeditor.js:
>
> >
> > -	CKEDITOR.plugins.addExternal('blockimagepaste', elgg.get_site_url() + 'mod/ckeditor/views/default/js/elgg/ckeditor/blockimagepaste.js', '');
>
> But I'm betting we've never said that out loud before, so I'm not
> surprised people do it.
>
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> <https://github.com/Elgg/Elgg/pull/7559/files#r21045225>.
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