sharify 0.1.0

Back types with shared memory and send them cheaply between processes.
Documentation
Patched source files from the shared_memory crate (https://github.com/elast0ny/shared_memory-rs, master branch commit 63bf9a9185c79012d219c3b14fc7232fdc25ac6) are temporarily included as a submodule while waiting on the 0.12 release, see https://github.com/elast0ny/shared_memory-rs/pull/59. This is required for publishing sharify to https://crates.io/. The shared_memory Readme is included here to indicate the MIT license.