Bikeshed: glossary

[dominykas]

Originally raised point from #14:

Changes the getPatch function name to getCommitURL

The above, to me, is the "version of the parent (?) package expressed as an npm dependency descriptor", which is probably a horrible name for a function, however the "version of the parent package" is something we'll be referring to quite a bit, so may as well find a short word for that?

But we probably also have other terms (such as the "parent" package itself), that we may want to define so that we can use them consistently across the code and documentation.