rewrite median/mean/etc.
Merge branch 'master' of https://github.com/ganzm/AdvancedSystemsLab2013 into fast_percentiles_median_mean_variance

Conflicts:
	code/log_analyzer/src/ch/ethz/mlmq/log_analyzer/Bucket.java
Merge pull request #8 from ganzm/fast_percentiles_median_mean_variance

rewrite median/mean/etc.