Add license to repo. Add travis, version and license badges to README.

Author: mitchmindtree

LICENSE-MIT

@@ -0,0 +1,25 @@
+Copyright (c) 2015
+
+Permission is hereby granted, free of charge, to any
+person obtaining a copy of this software and associated
+documentation files (the "Software"), to deal in the
+Software without restriction, including without
+limitation the rights to use, copy, modify, merge,
+publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software
+is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice
+shall be included in all copies or substantial portions
+of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
+ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
+TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
+SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
+IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.

README.md

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-# coreaudio-rs
+# coreaudio-rs [![Build Status](https://travis-ci.org/RustAudio/coreaudio-rs.svg?branch=master)](https://travis-ci.org/RustAudio/coreaudio-rs) [![Crates.io](https://img.shields.io/crates/v/coreaudio-rs.svg)](https://crates.io/crates/coreaudio-rs) [![Crates.io](https://img.shields.io/crates/l/coreaudio-rs.svg)](https://github.com/RustAudio/coreaudio-rs/blob/master/LICENSE-MIT)
 
 A friendly rust interface for Apple's CoreAudio API.