Update composer files and move to undeprecated jrobo

RoboFile.php

@@ -29,7 +29,7 @@
 class RoboFile extends \Robo\Tasks
 {
 	// Load tasks from composer, see composer.json
-	use \joomla_projects\robo\loadTasks;
+	use \Joomla\Testing\Robo\Tasks\loadTasks;
 	use \Joomla\Jorobo\Tasks\loadTasks;
 
 	/**
@@ -83,7 +83,7 @@ private function getExecutableExtension()
 	{
 		if ($this->isWindows())
 		{
-			// Check wehter git.exe or git as command should be used,
+			// Check whether git.exe or git as command should be used,
 			// As on window both is possible
 			if (!$this->_exec('git.exe --version')->getMessage())
 			{

composer.json

@@ -8,16 +8,16 @@
         }
     },
     "require"    : {
-        "php": ">=5.3.10"
+        "php": ">=5.4"
     },
     "require-dev": {
         "codeception/codeception": "^2.2",
         "joomla-projects/joomla-browser": "v3.6.5.1",
         "consolidation/robo": "^1.0.0",
-        "joomla-projects/robo": "~0",
+        "joomla-projects/joomla-testing-robo": "~1.0",
         "joomla-projects/selenium-server-standalone": "v3.1.0",
         "fzaninotto/faker": "^1.6",
-        "joomla-projects/jorobo": "~0.6",
-        "Behat/Gherkin": "^4.4.1"
+        "joomla-projects/jorobo": "~0.7",
+        "behat/gherkin": "^4.4.1"
     }
 }