* Correct the return type annotation in a serves method
* Type-hint the driver in the abstract ValetDriver
* Correct the return type-hint in the sample ValetDriver
* Remove the return afrom the restartLinkedPhp method
* Remove the return annotation from the Caddy constructor
* Remove the return annotation from the Valet configuration constructor
* Removed the return from the prependPath method of the Configuration class
* Removed the return from the appendAsUser method of the Filesystem class
* Removed the return annotation from the Site constructor
* Corrected the parameter annotation of the link method in the Site class
* Order use statements by length in PhpFpm
* Remove the return annotation from the Valet constructor
* Allows for valet to run under PHP 5.5 as well.
Add checks for php55 to the mix.
* Allows for valet to run under PHP 5.5 as well.
Add checks for php55 to the mix.
* Update .travis.yml
* Update PhpFpm.php
* Add tests for php55