CHANGES IN VERSION 4.0.0
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o new function 'gGlobalAncova' for generalized linear models: groups of tested variables can be quantitative, categorical, ordinal and even of mixed types 

o new function 'Plot.features' for showing contributions of individual variables to global test statistic; equivalent to 'Plot.genes', but for 'gGlobalAncova'

o new function 'gGlobalAncova.hierarchical' for hierarchical testing. 

o new S4-class 'GAhier' for storing results of gGlobalAncova.hierarchical     

o new methods 'show', 'results', 'sigEndnodes', and 'Plot.hierarchy' to access and visualize results from 'GAhier' objects

o added CITATION and NEWS files

o Vignettes are now created with knitr

