ENH: registry will now automatically construct read and write methods
DOC: removed duplicate format listing
ENH: generated docs handle compound formats better.
DOC: fixed indentation in generated docstring
DOC: whitespace
Merge pull request #672 from ebolyen/generated_oop

ENH: registry will now automatically construct read and write methods
Merge branch 'master' into issue-653
Update to new OOP read/write framework additions

Also fix py3 errors by making BiologicalSequence.__getitem__ more flexible with input types.