Vim: improve React lifecycle snippets

We can change `cwup` to `cwu` because it won't clash with the existing
`cwum` (`componentWillUnmount`). We can change `cdup` to `cdu` because
there is no `componentDidUnmount` that we could potentially clash with.

Signed-off-by: Wincent Colaiuta <win@wincent.com>
Vim: tweaks for test environment

These adaptations are for the test environment I'm currently working
with.

Signed-off-by: Wincent Colaiuta <win@wincent.com>
Add GO_PATH

Principally of interest because it provides a place for `go get` to put
stuff.

Signed-off-by: Wincent Colaiuta <win@wincent.com>
Mercurial: add .hgrc file

This is the .hgrc file I've been working with for a while now. It's a
starting point at least...

Signed-off-by: Wincent Colaiuta <win@wincent.com>