Added ability to embed via URL, put script in header

Using
http://codex.wordpress.org/Function_Reference/wp_embed_register_handler
to convert wedgie url to embed, no need to type in a more complex short
code. Kept short code for backwards compatibility. Wedgie script now
included in the header, only once per page that has a wedgie on it.
Updated github readme
Updated readme's to show proper embed url
Merge pull request #1 from ckeboss/master

Added ability to embed wedgie from url without shortcode, moved script to header