Allow modules and libs as vararg and support DelegatingProjectDependency

[DatL4g]

Removes the allowModules and allowLibs methods.
Makes allow compatible with a vararg instead.

Added support for passing modules as DelegatingProjectDependency so it can be used like this:

allow(":moduleA", ":moduleB")

// or the typed (delegated) variant
allow(projects.moduleA, projects.moduleB)

[rubensousa]

Thanks for the PR! Would you mind including an example in the sample project for the new APIs? Thanks!

[rubensousa]

Approved, this will be shipped in the next release. If I have time, I'll include #52 as well