Change config from json to yaml

- Added possibility to override config with env vars
- Reorganized config structures

functional/Procfile

@@ -1,2 +1,2 @@
 client: go run client.go
-server: go run ../cmd/main.go -config ./functional-config.json -alsologtostderr
+server: go run ../cmd/main.go -config ./functional-config.yml -alsologtostderr

functional/functional-config.json

@@ -1,21 +0,0 @@
-{
-  "Host": ":8080",
-  "SSL": false,
-  "Profiling": true,
-  "SSLHost": ":8090",
-  "SSLKeyFile": "key.pem",
-  "SSLCertFile": "cert.pem",
-  "Apps": [
-    {
-      "ApplicationDisabled": false,
-      "OnlySSL": false,
-      "Secret": "7ad3753142a6693b25b9",
-      "Key": "278d525bdf162c739803",
-      "Name": "App for Functional Test",
-      "AppID": "1",
-      "UserEvents": true,
-      "WebHooks": true,
-      "URLWebHook": "http://127.0.0.1:5000/hook"
-    }
-  ]
-}

functional/functional-config.yml

@@ -0,0 +1,19 @@
+---
+host: ':8080'
+profiling: false
+ssl:
+  enabled: false
+  host: ':4343'
+  key_file: 'key.pem'
+  cert_file: 'cert.pem'
+apps:
+  - name: 'Sample Application'
+    enabled: true
+    only_ssl: false
+    key: '278d525bdf162c739803'
+    secret: '7ad3753142a6693b25b9'
+    app_id: '1'
+    user_events: true
+    webhooks:
+      enabled: true # Default is false
+      url: 'http://127.0.0.1:5000/hook'