fix(Dgeni): do not modify `package.dependencies` property

This was problematic if you wanted to reuse a package more than once, since
the second time you used it the inline dependencies had been removed.
fix(Dgeni): require Package not package

The file containing the Package module has a capital P.
chore(package.json): update to version 0.4.0-beta.2
refact(Dgeni): remove dependency on 'es6-shim' and `Map`

The `Map` provided by es6-shim is not truly compatible with true ES6
Maps or works well with libraries that want to iterate over the items,
such as Jasmine and Nunjucks.
docs(README): add extra pseudo processors for path computation