First pass at merging and rewriting documentation.
Add AUTHORS file.
Second pass
Add modules
Removed MODULES.md
Added async example and other minor updates.
Merge branch 'bs-docs' of github.com:typekit/webfontloader into bs-docs
Fix a couple typos
Add Ascender module.
Change Google CDN urls to explicit version and add note about "latest" url.
Rewrite so all examples use WebFontConfig option.
Add note about using multiple providers at the same time.
webfontloader => WebFont Loader
Add note about async vs. sync.
Language tweaks and improvements, and get rid of extra whitespace

Improving and clarifying some of the language used in the README.
Add an example of the CSS file to the custom CSS example
Change README instances of "WebFont Loader" to "Web Font Loader"

Both Google and Typekit have standardized on using "web fonts" instead of a
single "webfonts" to refer to fonts included with font-face on the page. This
awkward capitalization was originally written back when the industry was still
figuring this out, but we should make it consistent with our preferred
terminology at this point. Luckily, nothing in code needs to be changed since
CamelCase works the same way no matter what.
Additional language improvements
Merge branch 'master' into bs-docs
Merge branch 'bs-docs' of github.com:typekit/webfontloader into bs-docs