Make the build output go to \bin\x directly

This change cuts out the ability to build debug/release and x86/x64 into
separate directory trees, but you already can't do that while maintaining
js1 at the same version so this seems more convenient in the meantime.
Add script to ilmerge assemblies into their exes
Update run_tests.sh with new paths

Upshot of moving the build output is that this no longer requires
configuration information to be able to run the tests following a build,
the output directory is the same for all configurations.
Merge pull request #154 from EventStore/merging

Merging