revamped cf7 integration for v3.9; removed all old styles

* matching changes per http://contactform7.com/2014/07/02/contact-form-7-39-beta/
* removed all older cf7 plugin support
updating readmes, version
add metaboxes after save button
Merge pull request #12 from zaus/cf7-3p9

Merge fixes for -- Cf7 3p9