Issue #371 Implemented RtCollaborators methods and unit Tests.
PDD definition fix in RtCollaborators.
RtCollaborators constructor made non public.
Merge branch 'master' of https://github.com/jcabi/jcabi-github into 371
Merge branch 'master' of https://github.com/jcabi/jcabi-github into 371
#564 - MkOrganizations.get() replace hard-coded created_at value with current time
#571 - Content.Smart#repo() method causes infinite recursion
Issue #371 Impl. Fix for hardcoded User instantiation
Merge pull request #526 from andrescandal/371

#526: pull request Issue #371 Implemented RtCollaborators methods and unit Tests.
#571 - Content.Smart#repo() method causes infinite recursion
#564 - MkOrganizations.get() replace hard-coded created_at value with current time (added missing unit test)
#564 - MkOrganizations.get() replace hard-coded created_at value with current time (added java.util.Date import)
#564 - MkOrganizations.get() replace hard-coded created_at value with current time (removed coumpound name variables)
Merge pull request #577 from carlos-a-crespo/task-571

#577: pull request #571 - Content.Smart#repo() method causes infinite recursion
#564 - MkOrganizations.get() replace hard-coded created_at value with current time (removed single use variable, used of TimeUnit to sleep thread and corrected identation)
Merge pull request #576 from carlos-a-crespo/task-564

#576: pull request #564 - MkOrganizations.get() replace hard-coded created_at value with cu...