Added case class <-> HList conversion test.
Added case class <-> HList conversion test.

roberth/shapeless,milessabin/shapeless,joescii/shapeless,notxcain/shapeless,Atry/shapeless,khronnuz/shapeless,TomasMikula/shapeless,fthomas/shapeless,clhodapp/shapeless,lukasz-golebiewski/shapeless,retronym/shapeless,malcolmgreaves/shapeless,tek/shapeless,wheaties/shapeless,isaka/shapeless,alexarchambault/shapeless,triggerNZ/shapeless,lambdista/shapeless,liff/shapeless