Changes

tsk40 Adds REST endpoint to create stories
This commit adds the necessary REST controller method, in addition to 
the related unit and integration tests and DTOs.
The test story matcher was modified to allow ignoring comparing dates, 
as when a story is created its creation date is set automatically by the 
EJB to the current date, and thus it is not predictable beforehand. 
Likewise, I realized that the @ShouldMatchDataSet annotation has an 
additional parameter to ignore the unpredictable date column, so let's 
get rid of a helper method I implemented in a previous commit to pass 
tests.