Manage default ban site or recommand site list.

[zealrant]

Hi, I really appreciate this module. When I chat on slack, it is very useful finding proper image quickly.

However, sometimes I need to filtering like "hubot img -" or "hubot img site:".

I tried to add that list automatically at hubot level parsing msg part. But, It makes complex code sequence and interrupt other module.

If you have any idea for improvement of this function. Please help.