memsec 0.5.3

Rust implementation `libsodium/utils`.
Documentation 
# memsec
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Rust implementation `libsodium/utils`.

* [x] `memeq`/`memcmp`
* [x] `memset`/`memzero`
* [x] `mlock`/`munlock`
* [x] `alloc`/`free`/`mprotect`

ref
---

* [Securing memory allocations](https://download.libsodium.org/doc/helpers/memory_management.html)
* [rlibc](https://github.com/alexcrichton/rlibc)
* [aligned_alloc.rs](https://github.com/jonas-schievink/aligned_alloc.rs)
* [cst_time_memcmp](https://github.com/chmike/cst_time_memcmp)