Fixes home directory handling.

path.resolve/normalise don't actually deal with HOME (~) expansion, since Node core believes this should be treated in a cross-platform way by lib_uv (https://github.com/joyent/libuv/issues/468). Since we only need the home directory of the current user, this quick'n'dirty hack should do.
Bumps to 0.2.1

Supports a '~/.whisper.d/.whisper' file as well as a '~/.whisper' file. This should make it easier to global configurations that depend on other tasks by using a package.json and node_module folder that don't interfere with everything else in your projects.