Late load of paperjs should still run paperscripts

See this problem html http://stackoverflow.com/questions/14110205/dynamically-loading-a-script-changes-its-behaviour/14114337 and note how jquery handle this at https://github.com/jquery/jquery/blob/master/src/core.js#L768
Merge pull request #156 from ubershmekel/patch-2

Late load of paperjs should still run paperscripts