Allow an optional '>' before 'module' when detecting the module name.

The regex now handles this kind of line in Bird format:

> module Foo where

Also, I had to make a symlink from haskell to lhaskell in after/ftplugin
to get lhs files to work.
Merge pull request #36 from carlohamalainen/master

Allow an optional '>' before 'module' when detecting the module name.