Improve webmail editor

- Fixed handling of saving drafts
- Fixed handling of message type (HTML/plain)
- Added primitive handling of attachments

UI/WebServerResources/bower.json

@@ -8,6 +8,7 @@
     "angular-foundation": "~0.3",
     "angular-recursion": "~1.0",
     "angular-vs-repeat": ">=1.0",
+    "angular-file-upload": "~1.0",
     "ng-tags-input": "~2.0",
     "foundation": ">5.3",
     "ionic": "1.0.0-beta.11",