Add makefile to install development branches into a sandbox

I have added a makefile that initialises a cabal sandbox, checks out (and refreshes) the development branches of the dependency repos, and installs it all into the sandbox.

All the tests pass except one, which I suspect is a nondeterminism thing that can be solved by sorting the result before comparing

```
Named Process Monitoring/Tracking:
  Process Death Results In Unregistration: [Failed]

Expected: equalTo ["proc.name.1","proc.name.2"]
     but: was ["proc.name.2","proc.name.1"]
  Monitoring Name Changes: [OK]
  Monitoring Registration: [OK]
```