Added some verbosity logging
Updated stupid test case
Requesting features with no value on longer throws an exception, instead returns 0
Added decoding sans dot chart (Sennrich, 2014) — still full of debugging statements
Removed debugging statements
Added check to ensure that rule collections are not empty
Fixed problem compiling lmplz on OS X (fixes #156)

Had to add link to boost_system-mt. Note that this still assumes you have the -mt
versions of the boost libraries installed, which isn't necessarily true (or required).
It would be nice to have a general solution to linking to boost.