TST: .travis.yml add sudo to nosetest call (currently permission denied)
DOC   fix sphinx html build warnings/errors (91 to 19)
STY  remove duplicate method
DOC update copyright in conf.py, one rst error
DOC rename extension .rst from unused files
DOC: copyright date, numpy doc standard cleanup in discrete_model
Merge pull request #618 from josef-pkt/doc_errors

Docs: fix the main warnings and errors during sphinx build, some doc standard work
ENH: add inter_rater.py, fleiss_kappa cohens_kappa, initial versions
DOC: some work on docstrings
REF: start with result class
REF: inter_rater move examples out of module
REF: fix moving/refactoring victims
TST/BUG: add test file (converted from ex), fix bug in ResultBunch
REF: cohens_kappa: change return_results option, drop obsolete example code
BUG/TST: cohens_kappa: add some tests for wt options
DOC: cohens_kappa some changes in explanation
DOC/BUG/TST  some loose ends, started to test against R::irr
BUG/TST: cohens_kappa, test against R:irr, add missing default weights
ENH: add helper functions to convert data, tests, tests for fleiss_kappa
REF/DOC: privatize two functions, improve module docstring