Merge remote-tracking branch 'canyon289/grw' into grw

# Conflicts:
#	pymc/tests/test_distributions_timeseries.py

Author: ricardoV94

pymc/tests/test_distributions.py

@@ -623,7 +623,8 @@ def test_hierarchical_obs_logpt():
     assert not any(isinstance(o, RandomVariable) for o in ops)
 
 
-class TestMatchesScipy:
+class LogpChecks():
+
     def check_logp(
         self,
         pymc_dist,
@@ -775,6 +776,8 @@ def _model_input_dict(model, param_vars, pt):
                     err_msg=str(invalid_value),
                 )
 
+class TestMatchesScipy(LogpChecks):
+
     def check_logcdf(
         self,
         pymc_dist,