Change layout
Add in popular with refresh, load page after download, work on single page view
Added new page view controller with scrolling, fixing the auto switch chapter by adding new swipe gesture recogniser and allow simultaneously detect gesture, switching from 1 page to 2 pages mode
Reload the page view when new page of the chapter is downloaded to make it display immediately, add buffering time when chapter is download to allow a few page loaded before user can view, remove action sheet when clicking on chapter
Add tap gesture to allow switching page when tapping on both side of the screen, change the communication between ChapterContentViewController and ChapterViewController from notification to delegate
Fix the bug that cause loading 2 pages jump to wrong page, added tracking code for all necessary action, add save data when page is downloaded to make sure it gets cleaned up correctly