Kathará

• Add Megalos (Kubernetes Manager) support
• Native tty wrappers for Unix/Windows for Docker exec and Socket-based for Kubernetes exec (using pyuv)
• Introduce bash autocompletion of commands on Linux
• Add TMUX Support (thanks to Marcel Großmann)
• It is now possible to specify a tag for a Docker image (thanks to Tommaso Caiazzi and Marcel Großmann)
• Support for unified version of Docker Network Plugin
• Minor fixes