Add support for version numbers and hash

[ciotlosm]

Add support for version number on startup. Implements #119

• Add version number from package
• Add support to use latest hash
• Documentation

[ciotlosm]

Included documentation as well.

[Koenkk]

I've refactored the code a bit, I think it's better to not have the user run a manual script (tag.sh) as people will forget to do this.

What do you think about this solution?

[ciotlosm]

Looks good. My idea was to avoid embedding too much and extra things for the git commit as that will be used far less when going stable and versioned. Also has to work even if people don’t clone but use export to make repo size smaller.

Happy with both approaches as we get benefit anyway. Just make sure we don’t get too much size increase.

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