Fixed a potential deadlock if there's too much data on stdout

https://github.com/spotify/luigi/pull/34
luigid as a console entry point through setup.py
simplified luigid cli
Merge branch 'master' of github.com:iheartradio/luigi

* 'master' of github.com:iheartradio/luigi:
  simplified luigid cli
  luigid as a console entry point through setup.py