ZP-680 Rename package to 'z-push-dev', remove version string so the

version can be determined from git tags. Released under the Affero GNU
General Public License (AGPL) version 3.

composer.json

 {
-	"name": "z-push/z-push",
+	"name": "z-push/z-push-dev",
 	"description": "Z-Push is an open-source application to synchronize ActiveSync compatible devices",
-	"version": "2.3.0",
 	"time": "2015-09-02",
 	"homepage": "http://z-push.org/",
 	"license": "AGPL-3.0",