Initial commit
Improve comments in Git ignore file
Ignore Composer lock file

For libraries, like this project, it's best to ignore the lock file.
Increase specificity of Git ignore file
Add link to Guzzle to README
Add Composer dependencies

* Package info in composer.json
* PHP >= 5.3 (I'll be using features of PHP 5.3)
* Guzzle 3.0 (any version)
* PHPUnit 3.7 (3.8 isn't compatible with PHP 5.3)
* Mockery 0.9.0
Create PHPUnit test suite
Add configuration for Travis CI
Add Scrutinizer CI configuration
Send coverage data from Travis to Scrutinizer