add dependency on cascading-helpers
add method to Util to find the message class of a proto's field; add a test to prove it works; make use of this function in ExpandProto to get emitted classes; test for that, too
extract a base class for ExpandProto
refactor ExpandRepeatedProto to be a subclass of AbstractExpandProto; refactor ExpandRepeatedProto to explicitly only operate on exactly one field that must be repeated; fix tests to match
add javadoc to ExpandRepeatedProto
delete redundant test case
documentation change
make ExtractProto implement KnowsEmittedClasses
trim out a few newlines
Merge pull request #17 from square/emit-known-classes

Emit known classes from ExpandProto, ExpandRepeatedProto, and ExtractProto