Added record toMap method
Added union toMap method
Fix in coproduct at signature
Added back overloads for coproduct methods taking a Nat as argument
Added back overloads for hlist methods taking a Nat as argument
Merge pull request #264 from alexarchambault/fix/coproductat

Fix in coproduct at signature
Merge pull request #265 from alexarchambault/fix/coproductsignatures

Added back some overload methods taking a Nat as argument
Merge pull request #266 from alexarchambault/feature/tomap

toMap
Bumped SBT version to 0.13.7.
Added record mapValues method