numeric rule variables now validate Decimal types and cast to Decimal type
updated operator tests to test for decimal types
added a float to decimal function because in python 2.6 casting a float to a Decimal does not work

fixed a python2.6 bug and also added long to the list of valid numeric variable types

fixed a bug with defining longs in python3

fixed a bug where long doesnt exist in python3

fixed a bug importing six

fixed another import issue with six

fixed a bug where float_to_decimal was being called on nonfloats
Merge branch 'master' into an_cast_numeric_to_decimal

Conflicts:
	business_rules/utils.py
Merge pull request #7 from akshayn1107/an_cast_numeric_to_decimal

Cast Numeric Rule Variables to Decimal