Support for aliasing ranges of IPs.

Addresses issue #3.
Added two test files for alias ranges.
Rename network::*::alias to network::alias.

Also rename network::*::alias::range to network::alias::range.
Merge branch 'feature/binding_range' into develop

Conflicts:
	spec/defines/network_if_alias_spec.rb
Merge branch 'develop' into feature/bridges