Provide greater consistency for badges related to versions. Fix#1181.
- the `version` function in `color-formatters` was previously returning the colour of the badge, but also its text with a leading _v_. It was broken down into two separate functions and the text formatting part was moved to `text-formatters`, where it really belongs.
- unit tests were added for these two functions in `color-formatters.spec` and `text-formatters.spec`, using Sazerac.
- as discussed in #1181, the leading _v_ was omitted for _xxxx-yy-zz_ date patterns. Any future exceptions can easily be added to the `ignoredVersionPatterns` pattern.
- the badge colour was previously switched to orange if a hyphen was found in the version string. This didn't seem ideal, instead pattern matching is done to find keywords such as `beta`, `alpha` or `snapshot`. Of course, this list can easily be extended.
- all badges related to versions now use the `versionText` and `versionColor` functions. There are a few rare exceptions, for instance in cases where the data returned by the service's API allows to figure things out without relying on any parsing/pattern matching (eg. `badgeData.colorscheme = prerelease ? 'orange' : 'blue';`, where `prerelease` is determined from an API's response).
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