Tweak UI.

- Reduce cursor offset at top and bottom of screen.
- Use Solarized Light.
- Take relative line numbers for a spin.
Implement 'Solarized Light' theme.
Try 'jk' for escaping from insert mode.

A few other shortcuts and tweaks, which will probably
remain unused, and be eventually deleted and forgotten.
Add constructor snippet.
Implement awesome 'initialise method arguments' awesomeness.
Add Ansible to basic brewfile.