Merge pull request #132 from cloudbuilders/tmux

add support for tmux if USE_TMUX=yes

stack.sh

@@ -958,6 +958,10 @@ fi
 function screen_it {
     NL=`echo -ne '\015'`
     if [[ "$ENABLED_SERVICES" =~ "$1" ]]; then
+        if [[ "$USE_TMUX" =~ "yes" ]]; then
+            tmux new-window -t stack -a -n "$1" "bash"
+            tmux send-keys "$2" C-M
+        else
             screen -S stack -X screen -t $1
             # sleep to allow bash to be ready to be send the command - we are
             # creating a new window in screen and then sends characters, so if
@@ -965,6 +969,7 @@ function screen_it {
             sleep 1
             screen -S stack -p $1 -X stuff "$2$NL"
         fi
+    fi
 }
 
 # create a new named screen to run processes in