tomboy-library git submodule references commit not in repo

[twm]

This is what I get on a clean checkout (following hijinks to work around #30):

$ git submodule update
fatal: reference is not a tree: c707dc647c42f6027b16574226ccf2d6c2589c44
Unable to checkout 'c707dc647c42f6027b16574226ccf2d6c2589c44' in submodule path 'tomboy-library'

[Dynalon]

should be fixed in master.