Reordered the shortcode attributes to match the order in the TinyMCE pop-up. Increased tested up to version number and plugin version number.

Updated readme tested up to version to 4.7.3.
Removed codekit config file.

Changed button classes to prevent conflicts with other themes, plugins etc. Changed labels of popup 'add button' window. Added custom button class and full width option to insert window

Changed button classes to prevent conflicts with other themes, plugins etc. Changed labels of popup 'add button' window. Added custom button class and full width option to insert window