add a glossary

[gbinal]

[evz]

Would be great to get going with something that, when given an acronym with an optional context, gives back a canonical form of what it stands for and maybe a brief description.

So, for example, when given LODES within the context of the Dept. of Commerce, you'd get back something like LEHD Origin-Destination Employment Statistics. Or maybe since it's a nested acronym, you could break that down even further.