Vim: make Jasmine snippets VISUAL compatible

UltiSnips has a nice feature that allows you to use a `${VISUAL}`
placeholder that references the currently selected text. This allows you
to easily wrap blocks of code with a snippet by selecting some text,
pressing the UltiSnips snippet trigger key (TAB in my case), typing the
snippet trigger, and pressing the trigger key again.

This commit adds these visual placeholders to my Jasmine snippets.
Vim: Add "module.exports" JavaScript snippet

This snippet might save me some typing when creating CommonJS modules.
Vim: Add some RSpec snippets

If I happen to be writing RSpec, I want some basic snippets.
Update submodules