Added an MPI pool and an example of using it to examples dir.
Fix a couple of comment typos.
Merge pull request #39 from jasondavies/typos

Fix a couple of comment typos.
packaging.

Don't fail if installed using requirements.txt and pip.
getting rid of py3 build on travis
Merge branch 'master' of https://github.com/farr/emcee into pt
Tweaks to parallel tempering documentation
Tweaks to main documentation to match style
Moving @farr up in the contributor list :grinning:
dev version
PEP8 all the things
a few more documentation tweaks
updating changelog
Merge https://github.com/joezuntz/emcee into mpi
Formatting and docs for the MPI example
fixing behaviour when lnprob returns 1d scalar
adding MPI example
Merge branch 'mpi' into 1.1.4-dev
Adding @joezuntz and alphabetizing contributor list
Fixing the MPI behaviour described in #38