BatchExperiments_1.0-621: 
- added missing import for R versions < 2.15.1

BatchExperiments_1.0-607: 
- reworked summarizeExperiments, the previous "details" options was basically unuseable
- minor bug fixes


BatchExperiments_1.0-528: 
- very minor bug fixes

BatchExperiments_1.0-486: 
- First submit to CRAN.
