changes to axonio.py to support python3, protocols in abf1, and fix some bugs
changed test_axonio.py to reflect python3 support
Should fix bug 151
changes to address comments on axonio.py and updated
docs/source/install.rst
full pep8 compliance
Merge pull request #160 from samuelgarcia/bug_151_brainvisionio

Should fix bug 151
Merge pull request #159 from tgbugs/master

Axon python3 support, new ABF1 protocol features, and bug fixes.