Made sure that the library builds on PHP 5.5

Author: waltertamboer

.gitignore

@@ -1,2 +1,3 @@
 build/
+composer.lock
 vendor/

composer.json

@@ -22,9 +22,9 @@
     "require-dev": {
         "phpunit/phpunit": "~4.0||~5.0",
         "squizlabs/php_codesniffer": "^2.3",
-        "zendframework/zend-eventmanager": "^3.0",
+        "zendframework/zend-eventmanager": "^2.3|^3.0",
         "zendframework/zend-modulemanager": "^2.7",
-        "zendframework/zend-mvc": "^3.0"
+        "zendframework/zend-mvc": "^2.3|^3.0"
     },
     "autoload": {
         "psr-4": {