CHANGES IN VERSION 1.2.1
------------------------
 o update CITATION. <2012-01-13 Mon>
 
CHANGES IN VERSION 1.1.22
------------------------
 o update vignette. <2011-07-23 Thu> 
 
 CHANGES IN VERSION 1.1.21
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 o update roxygen docs. <2011-07-23 Sat>
 
CHANGES IN VERSION 1.1.20
------------------------
 o update roxygen docs. <2011-07-19 Wed>
 
CHANGES IN VERSION 1.1.19
------------------------
 o change to using roxygen for generating Rd file. <2011-07-19 Tue>
 
CHANGES IN VERSION 1.1.18
------------------------
 o clean up some codes. <2011-07-19 Tue>
 
CHANGES IN VERSION 1.1.17
------------------------
 o Remove dependence of GOstats and Category. <2011-07-18 Mon>
 
CHANGES IN VERSION 1.1.16
------------------------
 o Re-implement function enrichGO. <2011-07-18 Mon>
 o add parameter readable, for mapping gene IDs to gene names. <2011-07-18 Mon>

CHANGES IN VERSION 1.1.15
------------------------
 o Modified plot method of groupGOResult, with colour coded. <2011-06-15 Wed>