CHANGES IN VERSION 1.7.2
------------------------

NEW FEATURES

    o New class TFFMFirst and TFFMDetail for next generation TFBSs.
    o Novel TFFM sequence logo.

BUG FIXES

    o Fix the bug in runMEME, which always return positive strand for 
      site sequence.

CHANGES IN VERSION 1.5.0
------------------------

NEW FEATURES

    o searchSeq now works on DNAStringSet. 
      The names in DNAStringSet will be used as seqname in SiteSet.
    o More user-friendly output in data.frame or GRanges from SiteSet, 
      SiteSetList, et al.
    o reverseComplement works on XMatrix now.
    o faster implmentation of searchPairBSgenome
