cohortBuilder 0.3.0

Add new filter of type "query" that allows to configure complex filtering rules with queryBuilder package.
Add filter-focused .print_filter method responsible for printing filter values when calling sum_up on cohort.

cohortBuilder 0.2.0

Changed the way reproducible code is returned. Now more flexibility is allowed with using e.g. .repro_code_tweak method.
The tblist source reproducible code is now using pipe chains for each dataset filtering.
Optimized filtering with having cache computed only for active filters.
Properly readjust steps and filters ids after step is removed.
Add .post_binding method, that allows to modify data object when binding is completed.
Fix reproducible code generation when no filters applied.