Koa Compressor

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[![Dependency Status][david-image]][david-url]
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Similar to [koa-compress][koa-compress],
except it basically __always__ compresses the response to gzip.
This is particularly nice for SPDY as the specifications states that user agents must always support gzip compression.
Thus, this compression middleware is a little simpler.

Differences:

- Accept-Encoding is ignored
- No vary header is set
- No this.compress option
- Sets content-length on compressed bodies if available (should probably port that to [koa-compress][koa-compress])

[koa-compress]: https://github.com/koajs/compress
[npm-image]: https://img.shields.io/npm/v/koa-compressor.svg?style=flat-square
[npm-url]: https://npmjs.org/package/koa-compressor
[github-tag]: http://img.shields.io/github/tag/koajs/compressor.svg?style=flat-square
[github-url]: https://github.com/koajs/compressor/tags
[travis-image]: https://img.shields.io/travis/koajs/compressor.svg?style=flat-square
[travis-url]: https://travis-ci.org/koajs/compressor
[coveralls-image]: https://img.shields.io/coveralls/koajs/compressor.svg?style=flat-square
[coveralls-url]: https://coveralls.io/r/koajs/compressor?branch=master
[david-image]: http://img.shields.io/david/koajs/compressor.svg?style=flat-square
[david-url]: https://david-dm.org/koajs/compressor
[license-image]: http://img.shields.io/npm/l/koa-compressor.svg?style=flat-square
[license-url]: LICENSE
[downloads-image]: http://img.shields.io/npm/dm/koa-compressor.svg?style=flat-square
[downloads-url]: https://npmjs.org/package/koa-compressor
[gittip-image]: https://img.shields.io/gittip/jonathanong.svg?style=flat-square
[gittip-url]: https://www.gittip.com/jonathanong/