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

@@ -28,7 +28,7 @@
         "cache/adapter-common": "^0.4"
     },
     "require-dev":       {
-        "phpunit/phpunit":         "^4.0 || ^5.1"
+        "phpunit/phpunit":         "^5.7.21"
     },
     "autoload":          {
         "psr-4":                 {
@@ -39,6 +39,7 @@
         ]
     },
     "minimum-stability": "dev",
+    "prefer-stable":     true,
     "extra": {
         "branch-alias": {
             "dev-master": "0.5-dev"