Added launch packager build step

example/ios/RNCWebViewExample.xcodeproj/project.pbxproj

 			buildConfigurationList = 13B07F931A680F5B00A75B9A /* Build configuration list for PBXNativeTarget "RNCWebViewExample" */;
 			buildPhases = (
 				13B07F871A680F5B00A75B9A /* Sources */,
+				382B320523C3B76000E88E8C /* Launch Packager */,
 				13B07F8C1A680F5B00A75B9A /* Frameworks */,
 				13B07F8E1A680F5B00A75B9A /* Resources */,
 				00DD1BFF1BD5951E006B06BC /* Bundle React Native code and images */,
 			shellPath = /bin/sh;
 			shellScript = "export NODE_BINARY=node\n../../node_modules/react-native/scripts/react-native-xcode.sh\n";
 		};
+		382B320523C3B76000E88E8C /* Launch Packager */ = {
+			isa = PBXShellScriptBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			inputFileListPaths = (
+			);
+			inputPaths = (
+			);
+			name = "Launch Packager";
+			outputFileListPaths = (
+			);
+			outputPaths = (
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+			shellPath = /bin/sh;
+			shellScript = "export RCT_METRO_PORT=\"${RCT_METRO_PORT:=8081}\"\necho \"export RCT_METRO_PORT=${RCT_METRO_PORT}\" > \"${SRCROOT}/../../node_modules/react-native/scripts/.packager.env\"\nif [ -z \"${RCT_NO_LAUNCH_PACKAGER+xxx}\" ] ; then\n  if nc -w 5 -z localhost ${RCT_METRO_PORT} ; then\n    if ! curl -s \"http://localhost:${RCT_METRO_PORT}/status\" | grep -q \"packager-status:running\" ; then\n      echo \"Port ${RCT_METRO_PORT} already in use, packager is either not running or not running correctly\"\n      exit 2\n    fi\n  else\n    open \"$SRCROOT/../../node_modules/react-native/scripts/launchPackager.command\" || echo \"Can't start packager automatically\"\n  fi\nfi\n";
+		};
 /* End PBXShellScriptBuildPhase section */
 
 /* Begin PBXSourcesBuildPhase section */