fix for tmux 2.0. closes #137.
fix for tmux 2.0. closes #137.

umi/blessed,piranna/blessed,anko/blessed,eush77/blessed,eush77/blessed,anko/blessed,piranna/blessed,rosshinkley/blessed,zBMNForks/blessed,zBMNForks/blessed,dbkaplun/blessed,rstr74/blessed,umi/blessed,rstr74/blessed,rosshinkley/blessed,gdseller/blessed,gdseller/blessed,dbkaplun/blessed,mcanthony/blessed,chjj/blessed,chjj/blessed,mcanthony/blessed