Issue #101 Implemented RtOrganization.
Issue #101 Changed URI from "/users/orgs" to "/orgs/:id"
Issue #221: Added tests for MkSearch.repos(), MkSearch.issues(), and MkSearch.users()
Issue #221: Implemented methods MkSearch.repos(), MkSearch.issues(), and MkSearch.users()
Merge branch 'master' into 101

Conflicts:
	src/main/java/com/jcabi/github/RtOrganization.java
Issue #101 Implemented RtOrganization and RtOrganizationTest
Issue #92 Implemented MkAssigneesTest
Merge branch 'master' into 92
Issue #92 Updated unit test class; added puzzle for the future task of
implementing MkCollaborators and allowing them to be returned as
assignees
Issue #93 Implemented MkAssignees
Merge branch 'master' into issue221

Conflicts:
	src/test/java/com/jcabi/github/mock/MkSearchTest.java
Issue #221: Fixed a problem in a test
Issue #303 Implemented PublicKey.Smart
Issue #303 Added PublicKeyTest, removed puzzle
Issue #272 Refactor RtPagination performed
Issue #272 Fixed comment
Issue #303 Suppressed TooManyMethods PMD warning
Issue #168 fixed replicated NotNull wrong message.
Merge remote-tracking branch 'upstream/master' into 272
Issue #272 Fixed compilation error in RtPublicKeys