Wiki updates for String, Number and Math libraries

[Luke Hoban]

The Harmony proposals page contains several additions to the core String, Number and Math libraries, adding some of the most commonly created and requested helper operations to these libraries for ES6.  I've uploaded to the wiki a first draft of candidate spec text for these library additions:
* DOC: http://wiki.ecmascript.org/lib/exe/fetch.php?media=harmony:es6libraryextensions.doc
* PDF: http://wiki.ecmascript.org/lib/exe/fetch.php?media=harmony:es6libraryextensions.pdf

There are a few remaining open issues, which I've listed in the corresponding proposal pages:
* Math Extras http://wiki.ecmascript.org/doku.php?id=harmony:more_math_functions
* String Extras http://wiki.ecmascript.org/doku.php?id=harmony:string_extras

Feedback welcome.

Luke