Add support of tinymce editor

[jerrywham]

I follow your own way of work and adapt them for tinymce object.
I hope you'll take my request in account.

[simsalabim]

Thanks a lot for the contribution! I am looking at the changes in whitespace-ignoring mode. Please follow the style guides and use tabs instead of spaces.

Also, can you please remove minified version from the pull request? Thanks!

[simsalabim]

This function seems redundant because it returns value of this.isTinyMCEExists().

[bartclaeys]

Which Tinymce version does this commit support?

[Ma3oBblu]

thanks for commit. can you merge it in master?

[simsalabim]

@Ma3oBblu I like the intent of the PR but I can't merge it in this state: it has unresolved feedback and wasn't rebased off of master so GitHub doesn't allow to merge it automatically. I'm not actively developing the project right now, but if you want to pick where the author left off and complete this functionality, I'd highly appreciate it.