Implemented YAML Syntax Highlighting

[xH3LLRAIZ3Rx]

It seems like YAML is not a syntax highlight for the code bbcode, can you please add that, because when I will eventually upgrade to 2.0 it would be really useful.

 

[Chris D]

I've just done a trip through the supported languages and added some more that could be useful including YAML for beta 2.

For existing installs you will need to add yaml to the allowedCodeLanguages option in Options > Messages.