ReadFromMemoryZeroCopy() in mem.go allows go-capnp to read capnp objects from an input []byte instead of an io.Reader
ReadFromMemoryZeroCopy() in mem.go allows go-capnp to read capnp objects from an input []byte instead of an io.Reader
Merge pull request #5 from glycerine/master

add function ReadFromMemoryZeroCopy() in mem.go