Update and rename README to README.md
Namespace the CSS classes

There was an issue where CSS classes were getting influenced by other
CSS rules on the page. This namespaces the CSS so that it no longer
happens.

Closes #2
Merge pull request #4 from jhubert/namespace-css-classes

Namespace the CSS classes
Update the CSS tag on keyup instead of timer

Per #1
Use a timeout as a debouncer

Per #1
Allow the user to specify a default box size