Added some results for the new Map/Set tests.

 * Added IETP results for the 2 new map tests, and fixed old Firefox/Chrome results.

 * Reordered the Map/Set tests so that tests involving the constructor occur before tests involving set()/add(), which then come before specific method tests.

 * Fixed something in the Proxy "setPrototypeOf" test which, while not clear whether it's spec-compliant, was causing some results to be unhelpful.
Fixed two Reflect results for IE Technical Preview.
Fixed a bug in the Reflect.construct test and results.
Added "WeakMap#set/WeakSet#add returns this" tests.

These are very similar to the Map#add and Map#set tests.
Added extra iterator-consumer tests.

Now, for-of, spread and destructuring have tests that check their functionality on strings, arrays and generic iterators alike.
Merge pull request #320 from webbedspace/generic-iterators

Added extra iterator consumer tests
Merge pull request #317 from webbedspace/mapfixes

Added some results for the new Map/Set tests