Re-allow js.Any ctors with arguments

Constructors with arguments to classes extending js.Any are useful and do
(at least) partially work. @lihaoyi requested the too restrictive check to
be removed until a more precise restriction is found.
Merge pull request #71 from gzm0/allow-js-ctor-args

Re-allow js.Any ctors with arguments
Merge pull request #76 from scala-js/master

Backport re-allow js.Any ctors to 2.11