Version numbers

[Ray Bellis]

Hi BIRD folks!

Could you please consider using consistent semantic versioning in your 
release numbers? (see semver.org)

Up until 2.13 all releases used the x.y.z format, with a trailing .0 for 
the first release in each minor release.  However the the 2.13 and 2.14 
releases did not - they just used x.y

This broke our deployment code that uses semantic version aware checks 
to tell whether the running daemon is not the same as the available package.

A formally adopted (and documented) version numbering policy would be of 
great use to system administrators.

thanks,

Ray