add 'filters' support to allow multiple gates to be returned by gating function and further to be added to gatingset. #73
handle the expansion of multi-population gating. #73
Merge branches 'trunk' and 'multiPop' into trunk
close #76
handle empty frame by returning dummy gates in .gating_wrapper function #77
relax tolerance when comparing gating results
update Rd
Merge branch 'trunk'
Merge branch 'master' of github.com:RGLab/openCyto