Add auto prefixer

packages/rocketchat-theme/.npm/package/npm-shrinkwrap.json

@@ -237,6 +237,44 @@
           }
         }
       }
+    },
+    "less-plugin-autoprefix": {
+      "version": "1.4.2",
+      "dependencies": {
+        "autoprefixer-core": {
+          "version": "5.2.1",
+          "dependencies": {
+            "browserslist": {
+              "version": "0.4.0"
+            },
+            "num2fraction": {
+              "version": "1.2.2"
+            },
+            "caniuse-db": {
+              "version": "1.0.30000342"
+            }
+          }
+        },
+        "postcss": {
+          "version": "4.1.16",
+          "dependencies": {
+            "es6-promise": {
+              "version": "2.3.0"
+            },
+            "source-map": {
+              "version": "0.4.4",
+              "dependencies": {
+                "amdefine": {
+                  "version": "1.0.0"
+                }
+              }
+            },
+            "js-base64": {
+              "version": "2.1.9"
+            }
+          }
+        }
+      }
     }
   }
 }

packages/rocketchat-theme/package.js

@@ -40,7 +40,8 @@ Package.onUse(function(api) {
 });
 
 Npm.depends({
-	'less': 'https://github.com/meteor/less.js/tarball/8130849eb3d7f0ecf0ca8d0af7c4207b0442e3f6'
+	'less': 'https://github.com/meteor/less.js/tarball/8130849eb3d7f0ecf0ca8d0af7c4207b0442e3f6',
+	'less-plugin-autoprefix': '1.4.2'
 });
 
 Package.onTest(function(api) {

packages/rocketchat-theme/server/server.coffee

@@ -1,4 +1,5 @@
 less = Npm.require('less')
+autoprefixer = Npm.require('less-plugin-autoprefix')
 
 RocketChat.theme = new class
 	variables: {}
@@ -46,6 +47,9 @@ RocketChat.theme = new class
 
 		options =
 			compress: true
+			plugins: [
+				new autoprefixer()
+			]
 
 		start = Date.now()
 		less.render content, options, (err, data) ->