Merge pull request #155 from webbedspace/gh-pages

Several additional ES6 tests
Updates for Traceur v-0.50
Merge pull request #156 from johnjbarton/traceur-0-50-updates

Updates for Traceur v-0.50
Update traceur results
ES6: reinforced the let test

Now, let functionality requires:
* Functional outside "extended mode" and the
"application/javascript;version=1.8" script tag type.
* Temporal dead zone (fixes #131).
* No hoisting out of blocks and for-loop heads.
* For-loops create fresh bindings.

I'm not able to check if EchoJS or IE11 actually pass this reinforced
test, but it seems Traceur doesn't (its 'experimental' output fails the
"qux" check as of today).
Merge branch 'gh-pages' of https://github.com/webbedspace/compat-table into gh-pages