fix Rd files. #72
1.fix namespace issue 2. remove filterId from the required argument list of plugin gating functions. #72
add internal gating test suite. #74
fix file path in vignette
fix vignette
Defunct registerGatingFunction #72
close #75
fix Rd errors
fix Rd
 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