Add Comparsion Ops (Multiple forms), removed root func, added sum and prod
Fix Python3 compatibility

Use sorted on dict_keys object, not sort which is unavailable
Add unittests

Prepare for travis testing with coverage

Add test for:
    Example
    Add operation
    And operation
    Or operation
    Not operation
fix tests
Add value comparison operators tests

Add Op tests:
    * Equals (==)
    * Not Equals (!=)
    * Greater Than (>)
    * Less Than (<)
    * Greater Than or Equal To (>=)
    * Less Than or Equal To (<=)