Updated the editor pod to the latest.
Now displaying navbar chevron when editing existing posts.
Added new chevron and x assets.
Merge branch 'release/4.4' of github.com:wordpress-mobile/WordPress-iOS into issue/editor-5-cancel-close-button

# By Matt Bumgardner (3) and others
# Via Sendhil Panchadsaram (8) and Diego Rey Mendez (2)
* 'release/4.4' of github.com:wordpress-mobile/WordPress-iOS:
  Updating Mixpanel to 2.5.3
  adds 4.4 release notes
  The bar buttons don't blink anymore when typing.
  Integrated the latest editor pod changes.
  Adjusting code to use safer `stringForKey` methods
  Fixes notifications state restoration
  updates localizations
  Removed some un-needed code.
  Color fix for navbar shadow app-wide.
  Removing the navbar shadow on the editor vc.

Conflicts:
	Pods/Pods.xcodeproj/project.pbxproj
	Pods/WordPress-iOS-Editor/Assets/ZSSRichTextEditor.js
	Pods/WordPress-iOS-Editor/Assets/editor.html
	Pods/WordPress-iOS-Editor/Classes/WPEditorView.m
Updated a getter.
Merge pull request #2462 from wordpress-mobile/issue/editor-5-cancel-close-button

Updates to new editor close/cancel button