Custom post type compatible/support

1. When the plugin is enabled, the editor in other post type will auto become text mode, and can’t switch to visual mode anymore. I think it is a bug.
2. I suggest that there is a option to check to enable the function, therefore we can decide where to use it. For me instance, I use Page Builder to design Page, and use Guternburg to write post, and I have a custom post type plugin to manager my document, and I hope to use this GREAT plugin.

Last, thanks for your contribution. The plugin is AWESOME.