no direct dependency on scipy
add alignment diffs
add alignment diffs conditionally (--with-diff)
require numpy but not scipy
create csv.writers in action()
pep8
- Fix error resulting in loss of clusters of size 1
- Include mapping of centroid name to itself so that readmap has one row
for each sequence in the input
more readable
Respect ambiguities in sequence diffs
Merge remote-tracking branch 'origin/master' into ssearch2csv
pep8
Merged in ssearch2csv (pull request #1)

enhance ssearch2csv
Merge remote-tracking branch 'bitbucket/master'

Conflicts:
	requirements.txt
	setup.py
Normalize cluster weights using --groups