document potential multiprocessing problem during install in 2.6 -- re-close #158
Hello world, gelben Stein!

Support for Yellowstone:
- Added ncar.json with yellowstone specifics.
- Make pip fallback to easy_install (there is a bug in pip that prevents it
  from working correctly over a proxy).
- Allow the user to specify an alternative address for the database (this
  probably deserves its own argument and not an environment variable).
- Stills needs a manual ssh command, want to see if we can integrate that.
- No harm was done to any table during this experiment, same can not be said
  about foreheads ...

Other:
- Fixed a logic error in the bootstrapper for python path.
Merge branch 'devel' of github.com:radical-cybertools/radical.pilot into devel
Merge branch 'devel' into feature/mpi

Conflicts:
	src/radical/pilot/bootstrapper/default_bootstrapper.sh
Change agent for yellowstone.