[Bug] Fixing #3 to resolve the installation script's dir correctly.

This commit fixes #3 by solving the installation directory correctly,
as it needs to resolve to the current directory. As described by
Issue #3, it does not resolve correctly when it is installed under
sub-modules.

*	modified:   scripts/install.js
- Replacing the current realpath resolution with the __dirname.
Merge pull request #5 from marcellodesales/Issue-3-install-path-resolution

[Bug] Fixing #4 to resolve the installation script's dir correctly.