Update Developer Documentation

jirikadlec2[CodePlex]
The developer documentation is out-of date. Important tasks are:
1) Update the plug-in (extension) developer tutorials for 1.3
2) Update design, architecture, dependency schemas and class diagrams
3) Create tutorials for working with HydroDesktop.SeriesView, HydroDesktop.Database and HydroDesktop.WebServices in a plug-in

4) Update documentation on working with Mercurial
5) Update documentation on working with the auto-build system

No files, tests, or entry points are identified. Start by locating the developer documentation, plug-in tutorials, architecture materials, Mercurial guidance, and auto-build documentation, then separate the requested updates into reviewable scopes and define completion for each.

Written by the indexing model from the issue text.