Fixed Node test script

cheerio.js chokes on the data-source attribute added to <script>
elements recently.
Merge pull request #226 from webbedspace/node-test-fix

Fixed Node test script
Fixed whitespace

In addition to removing tabs from data-es6.js, this also fixes an
inconsistency for Windows node - JSON.stringify() outputs \r\n for
line-break-containing strings in Windows instead of \n.
Merge pull request #228 from webbedspace/gh-pages

Fixed whitespace
Check arguments of well-known symbol functions

The Symbol.hasInstance and Symbol.toPrimitive tests now check for
expected argument values given to the user-defined functions.
Put some ES5 tests in comment strings

These tests thus no longer need explicit try-catch guards.
Added Firefox note to ES6 defaults results
Merge pull request #231 from webbedspace/hasinstance

Check arguments of Symbol.hasInstance and Symbol.toPrimitive user functions
Merge pull request #232 from webbedspace/es5-test-code

Put some ES5 tests in comment strings
Merge pull request #237 from webbedspace/defaults-footnotes

Added Firefox note to ES6 defaults results
Added 2 extra let tests

These tests check for the temporal dead zone, and correct for-loop
iteration bindings. They are distinct from the basic let-test, as they
represent more advanced or nuanced functionality.
Altered the TDZ test to include const

Both const and let are subject to the temporal dead zone.
Fixed a small bug

Also updated IE11 support for for-loop iteration scope.
Const test now checks that assignment is an error

Assigning to a const should be a syntax error. This commit does not
update the test results to match this stricter test, yet.

This also fixes tabs introduced in previous commits.
Updating const results

Almost everything fails this updated test by treating const reassignment
as a silent failure instead of a syntax error.
Updated TDZ test results

Also fixed a bug in the Node test script.
Fixed Traceur result for the let-for test

Also made the test's code less wide.
Added explanatory notes about let/const support
Added an anti-hoisting check to the const test

I was previously hesitant to include this, but since most platforms'
const support is invalidated already by their lack of error-throwing,
adding this check doesn't disturb the results at all.