Added possibility to fetch battery info from the SYBatterInfo class, using the IOKit framework.
The battery info is fetched once per minute and printed to the debug console for now.
Added CorePlot framework (https://code.google.com/p/core-plot/) as a dependency to support drawing plots
Gitignore for CorePlot

Telling Github app to ignore the CorePlot framework, which we do not
want to commit for legal reasons