Vim: override standard JavaScript "fun" snippet

I find the standard "fun" snippet to be a little annoying as by far the
most common function type I declare is anonymous (often assigned to a
property), so I end up having to awkwardly delete the function name and
the preceding space.

This snippet includes the preceding space in the placeholder, so it can
be deleted with a single tap of the delete key.

Signed-off-by: Wincent Colaiuta <win@wincent.com>
Vim: add JSX syntax highlighting

Specifically:

  https://github.com/mxw/vim-jsx

which depends on:

  https://github.com/pangloss/vim-javascript

linked from:

  http://facebook.github.io/react/blog/2013/12/30/community-roundup-13.html

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