Reflect the build progress that Visual Studio reports.

The progress of a build is dependent on the number of projects completely built, not the number of projects which have started building.
Use completed build numbers in the tool window caption as well. Display all currently building projects.
This should clarify the message a little, the list of projects in the build progress window are currently building.
Merge pull request #35 from lowjoel/reflect-visual-studio-progress

Reflect the build progress that Visual Studio reports