GUAC-801 Created password update dialog on home screen, grant self READ and UPDATE permission to users upon creation, and added sql update script to grant self READ and UPDATE permissions for users in pre-existing databases.

guacamole/src/main/webapp/app/index/styles/buttons.css

@@ -73,7 +73,7 @@ button.danger:active, a.button.danger:active {
     background: #932;
 }
 
-.button.logout, .button.manage, .button.back, .button.home {
+.button.logout, .button.manage, .button.back, .button.home, .button.change-password {
     background-repeat: no-repeat;
     background-size: 1em;
     background-position: 0.5em 0.45em;
@@ -95,3 +95,7 @@ button.danger:active, a.button.danger:active {
 .button.home {
     background-image: url('images/action-icons/guac-home.png');
 }
+
+.button.change-password {
+    background-image: url('images/action-icons/guac-key.png');
+}