EoD. Enhancing CompareTo.
Added new Builders.
Expanded DateTimeBuilder API.
Implemented CompareTo API.
Added CompareToTests.
Cleaned up EqualsTest.
Disabled ToStringTests.
Expanded documentation.
More tests for CompareTo.
Minor formatting change.
Added private no-arg constructors.
New builder.
Revert "New builder."

This reverts commit de1c4da1c8ca620c003e503d6ed347d6bb66b94b.