Added support for auto-incrementing assembly version(s).
Introduced 'Verify' build configuration to Albedo.UnitTests project. This makes MSBuild happier when running the solution with 'Verify' configuration.
Enabled XML documentation for Release builds.
Removed Microsoft.CSharp assembly reference. This makes MSBuild happier since the project currently targets .NET Framework 3.5.
Turned Code Analysis warnings to errors.

No action is taken for the following:

CA1006: Do not nest generic types in member signatures
CA2210: Assemblies should have valid strong names
Added 'xunit.runners' package.
Added .xunit project file.
Added build script to automate the Build, Verify, Test, and Release steps.
Added a build shell script,

although this script doesn't auto-increment the assembly versions, since
the auto-increment script is a PowerShell script, and that's a bit hard to
call from Bash.