Added savefig.bbox option to matplotlibrc
Allows the user to set the bounding box to 'tight,' which will override the defaults when saving from the interface.
Added savefig.pad_inches; refactored savefig.bbox
Changed "== None" to "is None"
Renamed bbox option from 'default' to 'standard'
Update whats_new.rst with new default settings
Moved ' .. _whats-new-1-1:' to correct position