Bump develop when release branch is created

[JakeGinnivan]

• Fixed an commit counting bug
• Based on discussion at alpha.branchname, beta, rc tags instead of branchname, unstable, beta? #632
• Fixes Increment "develop" version when branching release #695
• Updated related docs

// @GeertvanHorrik @o-o00o-o, @judgeaxl, @asbjornu

Keen on feedback. I think we can change develops tag to alpha, but I think maybe this should go into v4 and I try get an alpha of that out asap as this is really a breaking change.

[JakeGinnivan]

This is going into v4..

[GeertvanHorrik]

This is a fantastic feature, great to have!

Not sure if this PR also includes using alpha instead of unstable for the develop branch? If so, I think the images should be updated as well.

The rest looks really good, great work.

[asbjornu]

@JakeGinnivan This looks great, but I'm wondering why you've closed it and deleted the branch?

[JakeGinnivan]

Closed it out, am forward merging master into the v4 release branch then I will rebase this on top of that.

[JakeGinnivan]

Will reopen over the next few days. I forgot that I pulled a bunch of stuff into GitTools.Core in the v4 branch, which now I have to move the changes on master into Core

[tibitoth]

a forgotten bug

[asbjornu]

@totht91: If you need this and what @JakeGinnivan writes about the changes having moved to GitTools.Core is incorrect, please rebase the changes on the current HEAD of master and submit a pull request.