enhanced plugin support (#634)

- refactored admin controller and templates
- plugin support for entity actions
- changed column mail to email in customer table
- refactored theme events

composer.json

@@ -17,8 +17,10 @@
         "friendsofsymfony/rest-bundle": "^2.3",
         "friendsofsymfony/user-bundle": "~2.0",
         "fzaninotto/faker": "^1.8",
+        "gedmo/doctrine-extensions": "^2.4",
         "jms/serializer-bundle": "^2.4",
         "kevinpapst/adminlte-bundle": "~2.1",
+        "kimai/kimai2-composer": "^0.1",
         "mpdf/mpdf": "^7.1",
         "nelmio/api-doc-bundle": "^3.2",
         "ocramius/proxy-manager": "2.1.1",