Make "build.bat" run cleanly


build.bat runs into problems because the HintPaths used in the type provider tests expected to find DLLs in the bin/Debug folders, but these had not been built. 

* Change the build to place all Release results in the "build" directory under the root
* Change the build to place all Debug results in the "build\Debug" directory under the root

This means results are in the same place for "build.bat" and compiling the solutions, which means consistent HintPaths can be used.

I'm not sure why this wasn't picked up by the TeamCity build.