Numeric parts of versions can be negative

[Cruz Bishop]

The numeric parts of each Version class can be negative.

Areas found:

GenericVersion - Major, minor, build, revision
ThreePartVersion - Major, minor, build
TwoPartVersion - Major, minor
NumericVersion - Version

This can produce output such as

GenericVersion: 1.0.-5.2, -3.-1.4.2
ThreePartVersion: -1.2.-3, 1.-2.-3
TwoPartVersion: -1.2, 1.-2, -1.-2
NumericVersion: -265

This is bad. Negative numbers must never be used.

Versions affected:

1.1.0.0
1.1.1.0 snapshots