Improved feedback + logging.

[REMOVED]   Apptentive is now implemented by a standard iOS mail
            composer window and can optionally include logs.
[IMPROVED]  Better inf-level logging of what's going on.
[AUDITED]   Made sure no personal is going out through inf+ levels.

MasterPassword/iOS/MPGuideViewController.m

@@ -24,15 +24,22 @@
     [self.scrollView autoSizeContent];
 }
 
+- (void)viewWillAppear:(BOOL)animated {
+
+    inf(@"Guide will appear.");
+    [super viewWillAppear:animated];
+}
+
 - (void)viewDidAppear:(BOOL)animated {
-    
+
     [[UIApplication sharedApplication] setStatusBarHidden:YES withAnimation:animated? UIStatusBarAnimationSlide: UIStatusBarAnimationNone];
-    
+
     [super viewDidAppear:animated];
 }
 
 - (void)viewWillDisappear:(BOOL)animated {
 
+    inf(@"Guide will disappear.");
     [super viewWillDisappear:animated];
 
     [MPiOSConfig get].showQuickStart = [NSNumber numberWithBool:NO];