Make Query Generators Into Dynamic Modlues

Move bingQueriesGenerator to queryGenerators folder
main.py add queryGenerators folder to PATH
Add <queries> tag to config file
Modify config.py to read <queries> tag
Make bingQueriesGenerator dynamic loadable
_Picky:_

I'd rather do 
```"string %d" % number``` 
as it will do two things: 
1. [type coercion](http://en.wikipedia.org/wiki/Type_conversion)
2. Fail if type can not be coerced to **int**

The flip side of your approach is that everything _(?)_ can be converted to **string**, but you expect **int**. I know, your implementation is clear, but why not to have the compiler to play on your side?

Also, formatting in many cases is more clear and can be internally optimized, but string concatenation always create new strings as those are immutable.