Fix DC_pairs bug (when theta \ne 0).
Merge branch 'master' of https://github.com/ketch/nodepy

* 'master' of https://github.com/ketch/nodepy:
  Change README to markdown.
  dont globally import matplotlib
  syntax error in setup.py
  list modules in setup.py
  dont globally import matplotlib
  fix requirements line in setup.py
  Don't globally import matplotlib.
  Add install command for Travis.
  Add .travis.yml.
  Merson 4(3) pair

Conflicts:
	stability_function.py