Preparation for v3.1 release

The following tasks need completing, in order to release v3.1:

Coding

• Add missing tests for Copy()
• Agree naming/behaviour of With and Copy with @Odonno and add extra methods as required
• Check code against R#'s code inspections and implement any improvements

Documentation

• Deconstruct for Option, Maybe and Success types
• ValueOrDefault for Option and Maybe types
• Pattern matching for Success type
• Cons pattern matching
• Accessing Union values directly (@peter-majeed contribution)
• With and Copy extensions (@Odonno contribution)
• Add @Odonno and @peter-majeed to the contributor list
• Update release notes, version history and readme as required

Release

• Create v4.0 branch from v3.1.
• Remove Copy and With from the v3.1 branch
• Merge to master
• Add performance testing project back into solution (on v4.0 branch only!)
• Push master; package and publish nuget packages
• Push wiki changes
• And relax…

[peter-majeed]

No problem, @DavidArno, things look good here!

[DavidArno]

Oh and thanks to you both for your offers of help. Knowing that people cared that much spurred me on to putting a bit of effort in to getting v3.1 out. Thanks, both.