shuaci Hack 1.1.5 + Redeem Codes

- Fixed the bugs in settings about the us/uk pronounciation styles and automatic pronunciation.
- Changed the feedback way into email feedback.
- Fixed the issue that the membership page still shows non-VIP after subscribed the membership if without quit the app and reopen.

Make the function of [selection to review] free to all users.

Change the max number of words free users can learn from 100 to 30.

Improved iPad adaptation.

added a setting item for hiding the people studying online.
fixed a minor bug.

update the gesture recognizer of flashcards for flipping back to front with the whole screen range.
added beginner guide when entering the learning view with flashcards.
made the animation of flashcards faster when doing EN->CN or CN->EN stage in learning or reviewing.

Changed some functions into PRO exclusive (PRO themes, select to review, word search, vocabulary book)

Added [Dark Mode], [Membership], [Feedback & Wechat] in settings

Changed free trial period to 1 week

Added show the online learning users when studying.
Added quote page and long-press exit mechanism when giving up studying.
Added IAP, will show the purchase page when learn or review > 1 time per day.
Added Share App with Friends.