Self-encryption

* Swap forked memory_map for original memmap crate.

* Remove wildcards from dependencies.

* Update in line with sodiumoxide 0.0.9 changes.

* Increase file sizes to 1Gb using memory map (previously omitted).
* Compression pre encrypt and post encrypt in encrypt and decrypt methods
* Task passing to allow cores to be lit up when handling chunks

* Fixed lint warnings caused by latest Rust nightly

* Initial structure
* Test set-up
* Travis integration
* Docs creation
* Docs hosting (github.io)
* Windows CI set-up (ci.AppVeyor.com)
* Read/Write file in memory based buffer
* API version 0.0.8
* Implement disk based interface as example
* Full unit tests in lib.rs
* Integrations tests in tests module
* Benchmark tests for varying file sizes from 1 byte to 10 M/b
* API stable version 0.1.0
* Coverage analysis (coveralls ?)