Temporary solution which allow to call method on entity with 1 parameter
* this will be solved later with arbitrary number of parameters
Improved Doctrine populator

* it now enables to call methods on entity wit generated arguments
* added posibility of creating unique ids if they are not auto generated
* added posibility to load more entities with one-to-one relationship
Added missing usings
Merge pull request #105 from nenadalm/master

Possibility to call methods on entities, possibility to generate unique id