move priors and parameters to own modules
resolve circular import
transition...
fix imports
imports...
sigma not part of numpy, stupit
default size is None
read range from config
add hack because new version of astropy can't parse quantities
use pdf figures for arxiv
ignore eps figures
added sample method to model parameter
need at least 1d
sampling from prior working
updated normal prior
tested normal prior in ipython notebook
monte-carlo transform the error distributions from observerd to cartesian
don't roll axis in all cases
fix for size=None
use new prior sampling