allow extra library paths
unused parameter no error
Merge remote-tracking branch 'origin/master'
Merge remote-tracking branch 'origin/master'

Conflicts:
	CMakeLists.txt
Merge pull request #70 from stephentu/master

allow extra library path to be specified in build
Merge pull request #71 from stephentu/baseline

fix a few more sign compare warnings in DirichletDiscrete
remove rng arguments from lp.random
add sample_discrete test
Merge pull request #72 from forcedotcom/rng-args

Rng args
add a few macro helpers
require eigen3
add some useful multivariate sampling functions

uses eigen for some heavy lifting
add multivariate log-gamma function
add normal inverse wishart message type

also regen the protobuf files
add our NIW implementation
formatting
initial commit of the python NIW
NIW: rename mu0 -> mu and lambda -> kappa
WIP: NIW cython extension compiles now
NIW dbg: bug fixes