Upgrade to OpenVR 1.4.18 (#40)

Cleanup and update to latest openvr-sys

README.md

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+rust-openvr
+=====
+
+[![Build Status](https://travis-ci.org/rust-openvr/rust-openvr.svg?branch=master)](https://travis-ci.org/rust-openvr/rust-openvr)
+[![Join the chat at https://gitter.im/rust-openvr/rust-openvr](https://badges.gitter.im/rust-openvr/rust-openvr.svg)](https://gitter.im/rust-openvr/rust-openvr?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+
+High-level bindings for OpenVR.
+
+[API documentation](https://docs.rs/openvr/*/openvr/)
+
+[C/C++ API documentation](https://github.com/ValveSoftware/openvr/wiki/API-Documentation) for reference purposes.
+
+# Requirements
+
+`openvr-sys` requires CMake and C++ to compile and statically link the OpenVR library.
+
+**Imporant**: OpenVR does not support MinGW on Windows, i.e., you have to use the MSVC Rust toolchain and C++ compiler.
+
+# Initializing
+
+```rust
+extern crate openvr;
+
+fn main() {
+    // Initialize OpenVR.
+    let context = unsafe { openvr::init(openvr::ApplicationType::Scene) }.unwrap();
+
+    // Access subsystem.
+    let system = context.system().unwrap();
+
+    // See examples/test.rs for a more detailed example.
+}
+```