Reverse the base units conversion first until a more robust implementation is
done.
Redone in terms of base units.
But needs some thought into how to better structure the base units.
More bug fixes for units.
write chgcar for MD runs (initialization can be really bad on continuation runs)
Merge branch 'master' of github.com:materialsproject/pymatgen
Compare kpoints density in static run
write wavecar instead of chgcar
Merge branch 'master' of github.com:materialsproject/pymatgen
change to Poscar to read velocities on vasp versions that dont have whitespace
on some lines
ADd example ipython notebooks.
Fix unittests for ArrayWithUnit
 Cosmetic changes
Merge remote-tracking branch 'mpmaster/master'
 Save UnitError as class attribute of Unit, FloatWithUnit, ArrayWithUnit