re-add imports lost in removal from core.py (#1272)

Author: dustinvtran

pymc3/__init__.py

@@ -1,14 +1,17 @@
 __version__ = "3.0"
 
+from .blocking import *
 from .distributions import *
 from .math import *
 from .model import *
 from .stats import *
 from .sampling import *
 from .interactive_sampling import *
 from .step_methods import *
+from .theanof import *
 from .tuning import *
 from .variational import *
+from .vartypes import *
 from . import sampling
 
 from .debug import *