version 0.4
- Added many new functions ffdfdply, ffwhich, hist.ff, quantile.ff, cumsum, cummax
- Fixed bugs in 'with.ff' in combination with character and factor vectors.
- Welcomed a new contributer/author Jan Wijffels

version 0.3
- Added ffdfsave function that can be used to save an ffdf data.frame

version 0.2-2
- bug fix, subset for ffdf now works properly (thanks to Martijn Tennekes)

version 0.2-1
- bug fix, sum.ff with na.rm=TRUE is now working correctly (thanks to Andreas Borg)

version 0.2
- initial version