add guess_z option to fit_lc()
formatting improvements in plot_param_samples
Merge remote-tracking branch 'origin/master'
fix plot_param_samples
remove default model bounds

All the default bounds were one-sided, and one-sided bounds are not
supported in iminuit (nor will they be).
remove deprecated_fit_lc function
document how guessing works in fit_lc
improve plot_param_samples()
make animate_model() work again
update docs on photometric data
update fitting docs
update mcmc_lc to work with new models
update make_logo.py script for new models
deprecate plot_param_samples in favor of triangle.corner
docstring fixes to get doctests working
hack for astropy intersphinx inventory
non-interpolated dust propagation effects
python 2.6 compatibility fixes
add __all__ to extinction module
more prominent links on docs index page