Run tests in parallel (#170)

* Run tests in parallel

* Disable/enable some services

* Do not install redis on PHP 5.6

* Run composer update

* Install redis 3.0.0

* Enable redis extension but do not install

* Bugfix

* force instsall dependencies

* Force install stuff

* Fixes

* Minors

* Updated deps

* Debub

* Coverage fix

* Reduce sleep

* Because... you know

* Sleep less

* Applied changes from StyleCI

* Applied changes from StyleCI

Author: Nyholm

composer.json

@@ -11,6 +11,7 @@
     "homepage":    "http://www.php-cache.com/en/latest/",
     "license":     "MIT",
     "minimum-stability": "dev",
+    "prefer-stable":     true,
     "authors":     [
         {
             "name":     "Aaron Scherer",
@@ -35,7 +36,7 @@
         "psr/cache":             "^1.0"
     },
     "require-dev": {
-        "phpunit/phpunit":         "^4.0 || ^5.1",
+        "phpunit/phpunit":         "^5.7.21",
         "cache/integration-tests": "^0.16",
         "cache/array-adapter":     "^0.5"
     },