Merge pull request #27 from JuliaStats/devel

Devel
Various improvements
Slice sampler implementation
cleanup
Add funnel test for slice sampler; and tweaks
fix variance stderr (oops!)
fix example output too
doc improvements
fix 1d interface
typo
Merge pull request #29 from brendano/master

RFC: Slice sampler implementation
Add DataArrays dependency
removed Pdim and PMap types
Merge pull request #30 from fredo-dedup/master

removed PDim and PMap types
Rename Stats to StatsBase
Rename Stats to StatsBase
separation of Autodiff in independant submodule
fixed declaration error for Laplace
Fixed broken HMC sampler
Fixed broken RAM, HMCDA and NUTS due to Inf for