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
probably, this is the time to switch to packages as they should look like - [doc](https://docs.python.org/2/tutorial/modules.html#packages), WDYT?