remove logging from __init__.py

cc @quasiben
Merge pull request #792 from mrocklin/remove-logging

remove logging from __init__.py
bcolz test specifies dtype explicitly
other bcolz test specifies dtype
Data(Iterator) reifies iterator
Data: ChunkIterator excluded from iterator check
json resource functions accept kwargs
test Data('file.json') works properly
python: support iterators of dicts
test that computing stream works on iterators as well
chunkiterator precompute is noop
Merge pull request #794 from mrocklin/Data-on-Iterator

Data(Iterator) reifies iterator
mongo: pre_compute handles MongoQuery construction
Merge pull request #795 from mrocklin/python-dict

Python iterators of dicts
Merge branch 'master' of github.com:ContinuumIO/blaze into new-broadcast

Conflicts:
	blaze/compute/mongo.py
	blaze/compute/python.py
	blaze/compute/tests/test_python_compute.py