2281079 - Data comparison (data_is) condition implementation.

Initial commit for data comparison condition.

Based on https://github.com/fago/rules/pull/59.
It does not make sense now to have that method, because you are not unit testing it? Since this is just one line and the evaluate() method is not that complicated either I would suggest to just directly invoke the operations in the evaluate() method. I know @fubhy suggested it, but let's not overcomplicate things.