Remove bitdeli badge
Small typos, errors.  Fixed amalgamate (or lack of)
Merge branch 'master' of https://github.com/pyamg/pyamg
Fixes warning: pyamg/util/linalg.py:194: FutureWarning: comparison to  will
More == None or != None fixes.
Merge pull request #148 from mfergie/master

Fix FutureWarning about using `... == None`