…rg-mobile into issue/372-move-title-to-rich-text

* 'develop' of https://github.com/wordpress-mobile/gutenberg-mobile:
  Added missing react method signature (#523)
  passing mediaId in onMediaSelected (#521)
  v0.3.4
  Update GB bundle.
  Refactor name of MediaSource to avoid name collision on the main app.
  Update Gutenberg reference.
  refactor media upload methods to be inline with JS and iOS
  Refactor names of helper methods.
  Change media upload sync method.
  Implement enum using strings to simplify conversion logic.
  Remove whitespace
  Refactor method name to make it more obvious the intent.
  Refactor bridge media protocol methods to a single method.
  Merge branch 'develop' into feature/media_upload_methods_refactor
  Refactor media upload names to more consistent names.
  Removes border from title and changes the placeholder text.
  passing null to onImageQueryReattach() on Android
  Implement reattach of events on iOS.
  Add the ability to set font family, weight, size, and style from RN
  Recommend using the gutenberg-mobile repo

# Conflicts:
#	gutenberg