Import ThreadPool for rework from implementation in https://github.com/meh/ruby-thread
Renamespace Wires::RouterTable into Wires::Util
Start adding tests for ThreadPool
Move ThreadPool::Task to its own file

--HG--
extra : amend_source : ac21ca6933f1ef26cce86591162125a065ba732f
Some formatting to ThreadPool

--HG--
extra : amend_source : 244717a187c0d1247595e37b040b5b7e473d665f
Start of basic test for ThreadPool

--HG--
extra : amend_source : 64a4607fa0b3b775f1aec48c521657c63b4ae4f4
Some API changes