Change maximize and minimize shortcuts and reorder stuff
Merge all red-green commands
Move tmux.conf into its own directory
Do not create new tmux session on each terminal
Add tmux development session script
Add tmux/env to $PATH
Do not execute any commands in devenv.

I'll try to keep it as simple as possible in order to be as generic as
possible. There will be just a lot of other environments based on this
devenv.
Add tmux Django session