Removed pytest fixtures, replaced with globals. Added error test for Column into nd.array to make sure we add a test when it is fixed.
Removed pytest fixtures, replaced with globals. Added error test for Column into nd.array to make sure we add a test when it is fixed.

mrocklin/blaze,maxalbert/blaze,nkhuyu/blaze,ChinaQuants/blaze,dwillmer/blaze,cowlicks/blaze,LiaoPan/blaze,jdmcbr/blaze,dwillmer/blaze,caseyclements/blaze,LiaoPan/blaze,jcrist/blaze,jcrist/blaze,cowlicks/blaze,xlhtc007/blaze,cpcloud/blaze,alexmojaki/blaze,alexmojaki/blaze,mrocklin/blaze,jdmcbr/blaze,ChinaQuants/blaze,scls19fr/blaze,xlhtc007/blaze,ContinuumIO/blaze,caseyclements/blaze,cpcloud/blaze,ContinuumIO/blaze,scls19fr/blaze,maxalbert/blaze,nkhuyu/blaze