codeintel: javascript: rudimentary support for ES6 fat arrow functions
http://bugs.activestate.com/show_bug.cgi?id=100070

This isn't acutally quite correct, but gets us close enough
rn=

(integrated from komodo (trunk) change 82020 by marky)

git-svn-id: http://svn.openkomodo.com/repos/openkomodo/trunk@13646 b87d16e7-d29f-4ee1-b5ec-817d645d335f