switch to relative imports

simplifies the installation of emcee into sub-diretories of other projects

Signed-off-by: Dan F-M <danfm@nyu.edu>
Update testimonials.rst

Sparre et al. (2013) added to testimonials.
[faq] Add section on C++ wrapping, pickling, and parameter limits
Merge pull request #74 from martinsparre/master

Update testimonials.rst
Merge pull request #77 from fredRos/master

[faq] Add section on C++ wrapping, pickling, and parameter limits
Re-licensing under MIT
another remaining GPL reference
updating license in document
updated docs to 2.0 and cleaned up the front page layout
updating-ish testimonials list... can't keep up!
starting a fitting-a-line example
first draft of fitting a line example
Adding PyPI badges
Update testimonials.rst
Merge pull request #80 from lauralwatkins/patch-1

Update testimonials.rst
Added new reference to testimonials
Merge pull request #81 from adrn/apw-references

Added new reference to testimonials
Adding debingging comments to NaN check in lnprob #66
Adding debugging comments to NaN check in lnprob #66
Merge branch 'master' of github.com:dfm/emcee