WIP: Tmuxinator 0.7.0

Pull request for 0.7.0. Time for some new features for tmuxinator.

- [ ] Per directory tmuxinator projects #106 #91
- [ ] Rewrite bash and zsh completion manually so they are fast #115 #111 
- [ ] Investigate iTerm2 integration and see if it'll be easy to add or not #114 
- [ ] Synchronize panes support #97 
- [ ] Support the join command in tmux #78 
- [ ] Generate project file from tmux session #61 
- [ ] ERB support in config file. #51