Added a new fromiter() constructor.  Can use a Fixed shape or TypeVar (unknown length).
Added a new fromiter() constructor.  Can use a Fixed shape or TypeVar (unknown length).

Conflicts:

	blaze/tests/test_quickstart.py
	blaze/toplevel.py

seibert/blaze-core,seibert/blaze-core,seibert/blaze-core,seibert/blaze-core,seibert/blaze-core