Experimental/unstable change: build objects right away and return them with field
More testing for the required method
First implementation of grouping (but appear to works and no test breaks)
To prevent bad configurations, raise an exception on rule overwriting
Added a warnings/reset_warnings method to the base class
Retrieve group by name. Set a warning if no checks were done
Grouping: set groups with "prepare", documentation, tests, examples.
Added syntax sugar for ->field (+ docs and tests)
Improved default error message for password length
Improved default message for not matching group
Improvement: assure that the object is not feeded with garbage
Merge branch 'feature/group-validation'