Fixes variable, must be a Hash, see #11
Fixes issues with start|stop|restart

- Fixed typos 
- replaces exec w/system: system allows the calling script to continue; 
  and allows "rake stop start".
- rake start also runs configure, just to be on the safe side.
README: adds paragraph re/upgrading
Merge branch 'master' of github.com:kinkome/pipe2me