withoutDefaultToolbarButtons() for RichText

[ryangjchandler]

The documentation is a bit misleading and it feels like calling enableToolbarButtons should only enable the buttons specified in the array argument.

The way to fix this would be disabling all the buttons you don't want using disableToolbarButtons or disabling all buttons and only enabling the ones you do want.

I'm proposing a new withoutDefaultToolbarButtons (or similarly named) method that just empties out $toolbarButtons.

[danharrin]

Implemented in v1.0.7 as disableAllToolbarButtons().