added webpack-encore for managing frontend assets #113 (#122)

* updated installation docu #113
* rewritten login page #113
* added icheck plugin #113
* changed to YesNoType in edit forms #113
* updated CONTRIBUTING.md #113
* added start of developer docu #113
* added compile scripts and compiled assets #113

composer.lock

@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
         "This file is @generated automatically"
     ],
-    "content-hash": "fcf570204034bd83c84fd7f92fc3fab4",
+    "content-hash": "53194682429edad5d07d635bbb0cb5e0",
     "packages": [
         {
             "name": "almasaeed2010/adminlte",
@@ -4475,6 +4475,34 @@
             "homepage": "https://symfony.com",
             "time": "2018-01-04T15:52:56+00:00"
         },
+        {
+            "name": "symfony/webpack-encore-pack",
+            "version": "v1.0.2",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/webpack-encore-pack.git",
+                "reference": "f9f4e91659e5f55de370d6aebe77e64bce35e4d3"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/webpack-encore-pack/zipball/f9f4e91659e5f55de370d6aebe77e64bce35e4d3",
+                "reference": "f9f4e91659e5f55de370d6aebe77e64bce35e4d3",
+                "shasum": ""
+            },
+            "type": "symfony-pack",
+            "extra": {
+                "thanks": {
+                    "name": "symfony/webpack-encore",
+                    "url": "https://github.com/symfony/webpack-encore"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "description": "A pack for Symfony Encore",
+            "time": "2017-12-21T02:20:09+00:00"
+        },
         {
             "name": "symfony/yaml",
             "version": "v4.0.3",