Minor changes to validate/validate.m for BioNetGen-2.2.x compatibility. BNG now writes output to current directory (rather than model directory). Added "-outdir" switch to validate script so BNG knows where to put the output files. 
Minor changes to validate/validate.m for BioNetGen-2.2.x compatibility. BNG now writes output to current directory (rather than model directory). Added "-outdir" switch to validate script so BNG knows where to put the output files. 

RuleWorld/nfsim,RuleWorld/nfsim,RuleWorld/nfsim,msneddon/nfsim,msneddon/nfsim,RuleWorld/nfsim,msneddon/nfsim