Continue to update/DRY up/discover/learn my terminal-based Dev environment

* Massive updates to .tmux.conf
* Install and being setting up Tmuxinator
* Vim (.vim/) underwent many changes
* Changes in .zshrc
  * Installed/configured tmux - added tmux and tmuxinator plugins for OhMyZsh
  * Also, Powerline required Python work - so python plugin for OhMyZsh added
  * Python dirs added to Path

* Also:
  * Playing w\gist-vim and exercism - Add .gist-vim and .exercism to .gitignore