Simplify prompt.
Add Node packages to path.
Create super-simple .zshrc
Fix path, so Homebrew kegs are loaded first.
Reinstate ZSH loading of paths, prompts, and so forth.
Move 'VISUAL' definition to system/env.zsh
Use Vim keybindings in terminal.
Add 'less' plugin.
Add rbenv.
Set Git editor to MacVim, hopefully.
Add HTML file settings. Ensure all file settings are local to current file.
Move all ftplugin settings to after.

Should resolve problems with HTML settings overriding
PHP settings.
Update colourscheme.
Add Python-specific settings.
Merge branch 'develop'