Adds script to cross build shapeless from multiple branches.
Adds script to cross build shapeless from multiple branches.

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