add the support of some more languages

[atisne]

Bash, Delphi, Diff, Erlang, Groovy, Haxe, PowerShell, Swift Source: https://github.com/syntaxhighlighter

[JohnMcLear]

The loading of these scripts is getting too heavy now, I suggest moving these different script to the settings.json file and letting the site admin decide which languages to include/exclude.

@atisne you okay doing that?

[atisne]

I agree in principle. I'm not sure to know how to do that.

[JohnMcLear]

It's pretty easy just take a look at some of my other plugins that use the settings file :) http://github.com/johnmclear