Fixing minor defects.

Fixed MafIndex not inheriting from object.

Fixed use of "+1" and "-1" to represent strands; changed to 1 and -1 (ints) like in Bio.SeqFeature.

Removed trailing whitespace in MafIO.py.
Merge branch 'alignio-maf' of github.com:adamnovak/biopython into alignio-maf

Conflicts:
	Bio/AlignIO/MafIO.py