added the extension instance for _sysfs.c
C extension to open and r/w to files
corrected ParseTupleusage and return statements
changed to use_kernelFileIO C extension
update changelog
debugging
convert new period to int before writing to driver file, solves issue #38
worked with Rekha to get _sysfs extension working
Merge branch 'rseetham-master'
Merge pull request #1 from alexanderhiam/master

changed sysfs.py to call the C extension
Merge https://github.com/rseetham/PyBBIO

worked with Alex debugging _kernelFileIO
debugging
run preinstall when installing from pip
testing
always init at import and register cleanup at exit
analogRead() can now alternatively be passed a path to an AIN file created by a cape overlay
merged sysfs C extension from master
missed merge conflict marker
working on fixing package structure and install process for pip and apt-get distribution