tinyDOM can now tell between query strings and DOM abjects passed to mu, allowing better chaining with μ(this)

tinyDOM.ajax() now returns the XMLHttpRequest, as it should have to
begin with

Added a minified version of tinyDOM

Added ajax support as a utility function. All options are passed in a
single object, as well as an optional success and error function

Updated library symbol to (more appropriate) 'μ' and added an alias as
'mu' in case unicode isn't available in an editor for whatever reason