Option to autocomplete nicknames from their member info page

https://github.com/vector-im/vector-ios/issues/317

Vector/ViewController/RoomViewController.m

@@ -33,7 +33,6 @@
 #import "SimpleRoomTitleView.h"
 #import "PreviewRoomTitleView.h"
 
-#import "RoomParticipantsViewController.h"
 #import "RoomMemberDetailsViewController.h"
 
 #import "SegmentedViewController.h"
@@ -1539,6 +1538,8 @@
             [titles addObject: NSLocalizedStringFromTable(@"room_details_people", @"Vector", nil)];
             
             RoomParticipantsViewController* participantsViewController = [[RoomParticipantsViewController alloc] init];
+            participantsViewController.delegate = self;
+            participantsViewController.enableMention = YES;
             participantsViewController.mxRoom = [session roomWithRoomId:roomid];
             participantsViewController.segmentedViewController = segmentedViewController;
             [viewControllers addObject:participantsViewController];
@@ -1576,10 +1577,10 @@
         if (selectedRoomMember)
         {
             RoomMemberDetailsViewController *memberViewController = pushedViewController;
-            // Set rageShake handler
-            memberViewController.rageShakeManager = [RageShakeManager sharedManager];
-            // Set delegate to handle start chat option
-            memberViewController.delegate = [AppDelegate theDelegate];
+            
+            // Set delegate to handle action on member (start chat, memtion)
+            memberViewController.delegate = self;
+            memberViewController.enableMention = YES;
             
             [memberViewController displayRoomMember:selectedRoomMember withMatrixRoom:self.roomDataSource.room];
             
@@ -1640,6 +1641,25 @@
     }
 }
 
+#pragma mark - RoomParticipantsViewControllerDelegate
+
+- (void)roomParticipantsViewController:(RoomParticipantsViewController *)roomParticipantsViewController mention:(MXRoomMember*)member
+{
+    [self mention:member];
+}
+
+#pragma mark - MXKRoomMemberDetailsViewControllerDelegate
+
+- (void)roomMemberDetailsViewController:(MXKRoomMemberDetailsViewController *)roomMemberDetailsViewController startChatWithMemberId:(NSString *)matrixId completion:(void (^)(void))completion
+{
+    [[AppDelegate theDelegate] startPrivateOneToOneRoomWithUserId:matrixId completion:completion];
+}
+
+- (void)roomMemberDetailsViewController:(MXKRoomMemberDetailsViewController *)roomMemberDetailsViewController mention:(MXRoomMember*)member
+{
+    [self mention:member];
+}
+
 #pragma mark - Action
 
 - (IBAction)onButtonPressed:(id)sender