Merge pull request #39 in ZP/z-push from feature/ZP-680-Composer-package to develop

* commit '5c9b2683':
  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.
  ZP-680 Bump to version 2.3 to go into develop, fix z-push.org link. Released under the Affero GNU General Public License (AGPL) version 3.
  ZP-660 Composer package. Released under the Affero GNU General Public License (AGPL) version 3. Creating a z-push/z-push package on https://packegist.org/ to be able to install released versions of z-push via Composer. This requires a composer.json file in the root of the package.

(cherry picked from commit 57704dea)

composer.json

+{
+	"name": "z-push/z-push-dev",
+	"description": "Z-Push is an open-source application to synchronize ActiveSync compatible devices",
+	"time": "2015-09-02",
+	"homepage": "http://z-push.org/",
+	"license": "AGPL-3.0",
+	"require": {
+		"php": ">=5.2.0"
+	}
+}