Support latest iOS
Fixed some issues while loading video file

1. Compatible with iphone7 plus, iphone7, ipad pro, iphone6 plus, iphone6 large-size devices.
2. Minor bug fixes.

Fix UI layout issue on iOS 7.1

1. Add a manual rotate video function
2. Change UI to iOS7

1. Fixed the video thumbnail problem in the trimming view for iOS7.

2. Improve the UI

1. Fix orientation bug when compressing iPhone/iPad/iPod record videos in version 1.3
2. Fix minor bugs.

1. fix no video bug when compressing some videos.

Fix "Converting failed" error when slimming some videos using low quality.

1. New app icon
2. Fixed the bug that could not slim small videos.
3. Improved the video trimming interface