Message limit & other improvements

* Implement message limit permitting to limit number of message shown when loading a conversation
* Reformat message date properly using angular JS instead of our own date parser
* replace /get/country call with /get/settings to retrieve all settings

This fixes issue #90

css/style.css

@@ -166,3 +166,11 @@
 	background-repeat: no-repeat;
 	height: 34px;
 }
+
+.label-invalid-input {
+	color: red;
+}
+
+label {
+	font-weight: bold;
+}