Various usability improvements (#665)

* Set password creator window title

* Fix TODO, help url is read from Info.plist instead of a string literal

* Remove width constraint for 'Set Defaults' button of password generator so text is not cropped

* Improve keyboard shortcuts
New entries can be created using cmd + n, while cmd + shift + n creates new groups. Creating new databases is probably done too rarely to warrant a keyboard shortcut.
Additionally the 'New' menu item now has a submenu containing actions to create new entries, groups and databases (fixing #405).

* Hook up keyboard shortcut cmd + backspace to delete action

* Use shorter date format in inspector and add special output for distant future

* Show date picker when expiration is activates for either groups or entries but no date set

* Prompt for key file pops up automatically when the field is selected using tab

* Focus title field when new groups are created (#606).

* Rename search method so text fields don't capture it (#531)

* Don't show empty tags

* Remove menu item used for debugging.

MacPass/MPEntryInspectorViewController.m

@@ -448,10 +448,11 @@ typedef NS_ENUM(NSUInteger, MPEntryTab) {
                        toObject:self
                     withKeyPath:[NSString stringWithFormat:@"%@.%@.%@", NSStringFromSelector(@selector(representedObject)), NSStringFromSelector(@selector(timeInfo)), NSStringFromSelector(@selector(expires))]
                         options:nil];
+
   [self.tagsTokenField bind:NSValueBinding
                    toObject:self
                 withKeyPath:[NSString stringWithFormat:@"%@.%@", NSStringFromSelector(@selector(representedObject)), NSStringFromSelector(@selector(tags))]
-                    options:nil];
+                    options:@{ NSValueTransformerNameBindingOption:MPTokenValueTransformerName }];
   
   
   [self.uuidTextField bind:NSValueBinding
@@ -510,6 +511,11 @@ typedef NS_ENUM(NSUInteger, MPEntryTab) {
   
 }
 
+- (IBAction)toggleExpire:(NSButton*)sender {
+  if([sender state] == NSOnState && [self.representedEntry.timeInfo.expirationDate isEqualToDate:[NSDate distantFuture]]) {
+    [NSApp sendAction:self.pickExpireDateButton.action to:nil from:self.pickExpireDateButton];
+  }
+}
 
 #pragma mark -
 #pragma mark MPDocument Notifications