I did Basic Testing of your plugin running WP 3.9.1, twentyfourteen and genesis sample theme, all works fine with no issues - I also concurrently ran the plugin "WordPress Visual Icon Fonts" and both worked alongside each other.
Multiple classes applied to the icons works well with the 'fa-' prefix.
For bonus testing, I ran the plugin on WordPress 4.0-beta2-20140805 via VVV - again no issues.
The icon preview area is slightly larger in the visual editor which is a good thing.
Hi Mickey,
I did Basic Testing of your plugin running WP 3.9.1, twentyfourteen and genesis sample theme, all works fine with no issues - I also concurrently ran the plugin "WordPress Visual Icon Fonts" and both worked alongside each other. Multiple classes applied to the icons works well with the 'fa-' prefix.
For bonus testing, I ran the plugin on WordPress 4.0-beta2-20140805 via VVV - again no issues.
The icon preview area is slightly larger in the visual editor which is a good thing.
Good job!