Add basics of a topic search.  Roughed in at this point.
Merge remote-tracking branch 'pr-1/master' into pr/1
Added / updated SearchClient and DTO comments. Copied updates to .Net 3.5 project.
Merge branch 'pr/1' into develop
Added TopicClient and updated Topic DTOs and the dependent SearchClient. Updated contributors and readme. Removed ".nuget" folder.
Replicated previous changes to .Net 3.5 client. Updated SearchClient method to the more generic search. Updated parameter names and comments. Created an internal, static, configuration class.
Added shared client configuration class.
Added DTO UML diagram. Added UserSearchResult DTO. Updated SearchEnvelope with Messages and Users.
Separated BaseUri constants to its own static class properties. Added undocumented MessageClient method and its integration test.
Replicated changes to .Net 3.5 client.
Moved all source code-related files under '/src' for GitHub pages preparation.
Moved source code back to root path. Added static HTML documentation site. Updated various dependencies to latest.
Reinstalled NuGet packages to ensure 'restore' works smoothly.
Added Shared Project. Merged duplicated (shared files) into the Shared Project.
Added InvitationClient. Updated undocumented clients into a separate namespace. Minor comments update.
Uprev to 0.4.0. Updated Readme and ReleaseNotes.
Merge branch 'develop'