Include gravatar images in registrant permissions panel, if configured

src/com/gitblit/wicket/panels/GravatarImage.java

 	public GravatarImage(String id, PersonIdent person) {
 		this(id, person, 0);
 	}
-
+	
 	public GravatarImage(String id, PersonIdent person, int width) {
+		this(id, person, width, true);
+	}
+
+	public GravatarImage(String id, PersonIdent person, int width, boolean linked) {
 		super(id);
 
 		String email = person.getEmailAddress() == null ? person.getName().toLowerCase() : person.getEmailAddress().toLowerCase();
 		ExternalImage image = new ExternalImage("image", url);
 		WicketUtils.setCssClass(image, "gravatar");
 		link.add(image);
-		WicketUtils.setHtmlTooltip(link,
+		if (linked) {
+			WicketUtils.setHtmlTooltip(link,
 				MessageFormat.format("View Gravatar profile for {0}", person.getName()));
-		add(link);
+		} else {
+			WicketUtils.setHtmlTooltip(link, person.getName());
+		}
+		add(link.setEnabled(linked));
 		setVisible(GitBlit.getBoolean(Keys.web.allowGravatar, true));
 	}
 }

src/com/gitblit/wicket/panels/RegistrantPermissionsPanel.html

 		<form style="padding: 20px 40px;" class="well form-inline" wicket:id="addPermissionForm">
 			<select class="input-large" wicket:id="registrant"></select> <select class="input-medium" wicket:id="permission"></select> <input class="btn btn-success" type="submit" value="Add" wicket:message="value:gb.add" wicket:id="addPermissionButton"/>
 		</form>
-	</div>	
+	</div>
+	
+	<wicket:fragment wicket:id="userRegistrant">
+		<span wicket:id="userAvatar"></span> <span style="font-weight: bold;" wicket:id="userName"></span>
+	</wicket:fragment>
+
+	<wicket:fragment wicket:id="teamRegistrant">
+		<span style="font-weight: bold;" wicket:id="teamName"></span>
+	</wicket:fragment>
 	
 </wicket:panel>
 </body>

src/com/gitblit/wicket/panels/RegistrantPermissionsPanel.java

 import org.apache.wicket.markup.html.form.DropDownChoice;
 import org.apache.wicket.markup.html.form.Form;
 import org.apache.wicket.markup.html.form.IChoiceRenderer;
+import org.apache.wicket.markup.html.panel.Fragment;
 import org.apache.wicket.markup.repeater.Item;
 import org.apache.wicket.markup.repeater.OddEvenItem;
 import org.apache.wicket.markup.repeater.RefreshingView;
 import org.apache.wicket.markup.repeater.util.ModelIteratorAdapter;
 import org.apache.wicket.model.CompoundPropertyModel;
 import org.apache.wicket.model.IModel;
+import org.eclipse.jgit.lib.PersonIdent;
 
 import com.gitblit.Constants.AccessPermission;
 import com.gitblit.Constants.PermissionType;
 import com.gitblit.Constants.RegistrantType;
+import com.gitblit.GitBlit;
 import com.gitblit.models.RegistrantAccessPermission;
+import com.gitblit.models.UserModel;
 import com.gitblit.utils.DeepCopier;
 import com.gitblit.utils.StringUtils;
 import com.gitblit.wicket.WicketUtils;
 						WicketUtils.setCssStyle(label, "font-weight: bold;");
 						item.add(label);
 					}
+				} else if (RegistrantType.USER.equals(entry.registrantType)) {
+					// user
+					PersonIdent ident = new PersonIdent(entry.registrant, null);
+					UserModel user = GitBlit.self().getUserModel(entry.registrant);
+					if (user != null) {
+						ident = new PersonIdent(user.getDisplayName(), user.emailAddress);
+					}
+
+					Fragment userFragment = new Fragment("registrant", "userRegistrant", RegistrantPermissionsPanel.this);
+					userFragment.add(new GravatarImage("userAvatar", ident, 16, false));
+					userFragment.add(new Label("userName", entry.registrant));					
+					item.add(userFragment);					
 				} else {
-					// user or team
-					Label label = new Label("registrant", entry.registrant);
-					WicketUtils.setCssStyle(label, "font-weight: bold;");
-					item.add(label);
+					// team
+					Fragment teamFragment = new Fragment("registrant", "teamRegistrant", RegistrantPermissionsPanel.this);
+					teamFragment.add(new Label("teamName", entry.registrant));
+					item.add(teamFragment);
 				}
 				switch (entry.permissionType) {
 				case OWNER: