Release management

[peetw]

Somewhat inspired by the NetTopologySuite project (see here and here), I was thinking that now that we have a (semi - see #87) working CI environment set up, it might be worth using it to help us deploy our NuGet packages in a more automated fashion?

For example, any commit on the "dev" branch would result in a pre-release version being released, whilst a commit to master would result in a full release being deployed. Obviously this would require a change to the current branching strategy, as we currently only branch off of master.

Just curious to see what people's thoughts are on this before I spend too much time investigating further :)