changed plotDETagStats to use ggplot, now plots additional quanitites
added savitzky_golay smoothing
added assertion in writeMatrix
bam2peakshape now plots any number of bam files in coordinated fashion
added scaling method
updated reset target
added contig_tsv to interface for consistency
added stats for DMR windows to report
cleaned up report
pep8 changes
Merge branch 'master' of ssh://github.com/CGATOxford/cgat
fixed unit tests for bam2peakshape
added workspace parameter