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
I reverted this line and removed the **__init__.py** files.
I tested it. You may test if you wish.
If you accept patch I will have time tonight to rewrite my wikisearch patch