Added conformance tests for Reflect methods, and added missing tests.

I also reordered them so that their order matches that of the Proxy tests.
Tentative support for compiler-filtered ES6 test HTML output.

Now, in addition to the normal es6/index.html, special versions whose tests have been pre-compiled with a given compiler. Currently 6to5, esnext and es6-transpiler are used. Polyfills are not yet inserted, nor is the output cleaned up compared to the normal table. Additionally, tests that use eval() or Function() will probably not work.
Fixed a slight bug with the compiled code.

To allow 6to5 to compile the test interiors, they are wrapped in an IIFE. But, this IIFE wasn't being II'd correctly.