fixes #468
extra whitespace
Merge branch 'master' of https://github.com/biocore/scikit-bio into issue468
ENH: ssw convenience function now returns Alignment object
Added changelog
supports NucleotideSequence
Making sure that all trajectories are numpy arrays
Merge pull request #470 from ebolyen/issue468

Fixes #468
Merge pull request #476 from josenavas/grad_bug

Making sure that all trajectories are numpy arrays
Merge branch 'master' into issue-464

Conflicts:
	CHANGELOG.md