Grunt: Clean up outdated information
* Use jshintrc:true which lets grunt defer autodiscovery of the file
to jshint instead of forcing it to '.jshintrc'. This also us to
override certain settings from a subdirectory, to match behaviour
of standalone jshint.
* Remove comments about "Known issues" in node-jscs, those have
been fixed a while back and were applied when we updated jscs
in
df8c455.
* Match load order.
* Use plain string instead of single-value array.
Change-Id: I7fd8db63ba164de705239c4b419de446ca7d6809