- Defined composite Execute command to encapsulate the default "execute" verb of MefBuild.exe.
- Moved TestCommand out of ExecuteCommandsTest to reuse it in ProgramTest.
- Changed CSharpCompiler to report compilation errors in test reqults.
- Initial implementation command-line processing logic in MefBuild's Program.Main.
- Changed CommandLineExportDescriptorProvider to temporarily ignore imports of collection types.