Run shell completion tests in an isolated tmux instance
Run shell completion tests in an isolated tmux instance

Makes these tests work when executed outside of tmux as well.

Adds tmux 1.6 compatibility. The tests should now work with tmux 1.6-1.9

xantage/hub,elancom/hub,dongjoon-hyun/hub,haikyuu/hub,rlugojr/hub,cpick/hub,aspiers/hub,ryo33/hub,tomasv/hub,nmfzone/hub,adjohnson916/hub,jingweno/hub,sideci-sample/sideci-sample-hub,naru0504/hub,aereal/hub,nlutsenko/hub,sbp/hub,pwaller/hub,haikyuu/hub,sbp/hub,jingweno/hub,adjohnson916/hub,hopil/hub,xantage/hub,terry2000/hub,ASidlinskiy/hub,xantage/hub,elancom/hub,cpick/hub,hopil/hub,RichardLitt/hub,ASidlinskiy/hub,nlutsenko/hub,cpick/hub,jpkrohling/hub,aspiers/hub,isundaylee/hub,SanCoder-Q/hub,dongjoon-hyun/hub,adjohnson916/hub,naru0504/hub,pankona/hub,sbp/hub,RichardLitt/hub,hb9kns/hub,AndBicScadMedia/hub,pwaller/hub,hb9kns/hub,dongjoon-hyun/hub,boris-rea/hub,boris-rea/hub,boris-rea/hub,dev4mobile/hub,pcorpet/hub,tomasv/hub,sideci-sample/sideci-sample-hub,jingweno/hub,dev4mobile/hub,aereal/hub,ZenPayroll/hub,AndBicScadMedia/hub,terry2000/hub,codydaig/hub,whilp/hub,codydaig/hub,aspiers/hub,github/hub,pankona/hub,AndBicScadMedia/hub,rlugojr/hub,hb9kns/hub,pwaller/hub,naru0504/hub,whilp/hub,nlutsenko/hub,github/hub,rlugojr/hub,jpkrohling/hub,nmfzone/hub,nmfzone/hub,Gusto/hub,tomasv/hub,SanCoder-Q/hub,dev4mobile/hub,Gusto/hub,ZenPayroll/hub,elancom/hub,whilp/hub,isundaylee/hub,RichardLitt/hub,sferik/hub,haikyuu/hub,jpkrohling/hub,hopil/hub,pcorpet/hub,codydaig/hub,pankona/hub,isundaylee/hub,pcorpet/hub,terry2000/hub,sferik/hub,github/hub,github/hub,SanCoder-Q/hub,ryo33/hub,ASidlinskiy/hub,aereal/hub,ryo33/hub