Extensions for kjell

• Kjell version >= 0.2.0
• Power-line patched font for extension kjell-prompt see https://github.com/Lokaltog/powerline-fonts

In the kjell root directory, run make install-extensions

• Create $USER/.kjell/extensions (if not already existing)
• Copy your extensions to this directory
• Start kjell

See EXTENSIONS.md for more information on how extensions are used.