added ChIPSeq class
updated classes
addedd NRF method to AlignedTags
added phantom_peak method to AlignedTags class
addedd NRF method to AlignedTags
added phantom_peak method to AlignedTags class
addedd NRF method to AlignedTags
Rename ChIPSeq class to Dataset class
fixed conflicts with remote version
just a test
Merge branch 'master' of https://github.com/xinwang2hms/SPP
Merge branch 'xinwangdev'