Merge branch 'persist', remote-tracking branch 'origin'
Fix datashape equality relation.
extracted extremely large test to their own file.
added a test that checks error in #30 at the carray level
First attempt at fixing #30
enabled unittests at blaze level for #30
Merge branch 'persist', remote-tracking branch 'origin' into persist
tweaked test_constructors.py to have more types checked