Add rbenv to PATH
Add MAMP and ./vendor/bin to PATH.
Override CSS commenting style for SCSS files.
Update path to Python virtualenvs.
Add line-spacing in MacVim.
Add shortcut for Tabularize alignment.
Add ~/bin to PATH.
Improve PHP snippets.
Rename PHP 'class' snippets.

Contains some more generic PHP snippets. Could probably
do with reorganising the PHP snippets in general.
Use <tab> to expand snippets.
Tidy up tab size and wrap width in filetypes.
Add SuperTab settings.
Lots of tweaking. See below for details:

- Remove YouCompleteMe. Too much hassle with Python versions.
- Require SuperTab, as an alternative to YouCompleteMe
- Set fallback 'omnifunc' for unknown filetypes.
- Recognise alternative extensions for Markdown files.
- Automatically trim trailing whitespace on save (not MD files).
Add mkvirtualenv aliases for Python versions.
Add 'file exists' conditional around statement.
Delete obsolete SuperTab settings.
Tweak appearance and behaviour of NERDTree.
Remove SuperTab, add NeoComplete.
Set the Syntastic Python syntax checker.
Add recommended NeoComplete settings.