Basic derivational endings

There doesn't seem to actually be a reason for these to be in a
different class than markers
fuu analysis for derivation endings

Well, they're more like infixes, whatever.
I don't even know. Don't forget to test unmarked, e.g. 3sg
Derivational endings, check

Though, I imagine I'm missing some edge cases.
Derivational endings, check!

Well, except for one snafu in which it's impossible to determine from an
expanded form what the verb lemma is.  (#5)

Also has stop-gaps for #4
Clean up analyzer coffeescript

Tried to make the finding minroot bit nicer... didn't work. Heh.
Merge pull request #6 from parryc/derivational-endings

Merge Derivational endings