Hrm, looking back at this, I don't think I added anything to this section of the README.md -- "`TrapperkeeperApp` protocol" -- about exception throwing and the `boot-*` functions.  I had only added verbiage to the "Errors During `init` or `start`" section -- which doesn't go into detail on what happens at the level of the `boot-*` functions.

@cprice404 -- Think we should update the "`TrapperkeeperApp` protocol" section to talk a bit more about this?