[PATCH] [libcxx] Add numerous options to libc++ LIT test suite configuration.

[Eric Fiselier]

I've rewritten the patch against TOT. There are a couple of changes.

- Removed ability to enable warnings for now.
- Added documentation of the `libcxx_site_config` option.
- Added documentation about how `compile_flags` and `link_flags` are delimited.


http://reviews.llvm.org/D5877

Files:
  test/lit.cfg
  test/lit.site.cfg.in
  www/index.html
  www/lit_usage.html

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