Jupyter with completion

Debug flag causes printing of raw messages

Added `ihaskell install` into build.sh

Fix flags

Adding flags to kernel mode

Change get-type style from pre to pre-wrap

Add a Gitter chat badge to README.md

Simplified cmdline interface

Make build status refer to only master branch

Fix empty Bird style code lines.

Empty Bird style code lines, i.e. lines containing only a single '>' were
treated like markdown. Only code lines with '> ' were treated like empty code
lines.

Fix IHaskell convert for ipynb files with nbformat 4.

The previous commit had missed some of the format changes from v3 to v4.

Ugh, fixed a couple of things in Linux install.