point to master branches for pubsweet frontend and server

package.json

@@ -26,7 +26,7 @@
     "font-awesome": "^4.7.0",
     "html-webpack-plugin": "^2.24.0",
     "json-loader": "^0.5.4",
-    "pubsweet-backend": "0.7.0",
+    "pubsweet-server": "git+https://gitlab.coko.foundation/pubsweet/pubsweet-server.git",
     "pubsweet-component-blog": "^0.1.0",
     "pubsweet-component-ink-backend": "0.0.4-alpha.3",
     "pubsweet-component-ink-frontend": "0.0.1",