Support all themes and modes

Hi,

a year ago or so, I found your very nice module, but I quickly noticed, that it only supports one "mode" (yaml) even though the ace editor supports A LOT more. Well I quickly made a private rip off (because I needed JSON as well) and called it ace_editor. I guess 95% of the code is equal to your module still.

Because there is already an ace_editor module here on Drupal I thought I may provide you with my module and If you think altering your module to support more themes and modes, you can do so. The code diff should be minimal.