Add a `VersionNumber` class similar to `Gem::Version`

[postmodern]

Add a VersionNumber class similar to Gem::Version, but accepts messier non-rubygem style versions. It must support parsing and comparing versions.

1234
1.2
1.2.3
1.2.3.4
1.2.3-4
1.2.3-4.5
1.2.3-foo
1.2.3.foo
1.2.3_4
1.2.3_4.5
1.2.3_foo
1.2.3+4
1.2.3+4.5
1.2.3+foo

This class can be used in ronin-exploits to aide in parsing and comparing version numbers.