Add local dependencies

Pipeline components don't have a direct dependency to BizTalk server and can _almost_ be build without a local BizTalk Server installation. Winterdom pipeline testing however adds a few extra dependencies to a number of BizTalk Server dlls. 

The current package of pipeline testing references with a hint path to BizTalk Server 2006 installation but as these dll are found in the GAC when having BizTalk installed this usually isn't a problem when working with later installations. 
The problem however occurs when trying to build on a clean build server where BizTalk isn't installed.

This pull request add all dependencies as local dependencies, making it possible to build on a clean machine with no installation requirements.