New features:
1. Introduce HTML5 Book: New way to publish your book for anyone to read in any browser on any platform
2. Convert book to Podcast: One video/audio in each page
3. Integrate with Box
4. Insert embed html or iframe element into HTML5 Book
5. Create 360 degree image slider (fixed layout book only)
6. Support panorama image
7. Allow more than one slideshow on the same page
8. Indicate position and size when moving or resizing element in fixed layout
9. Photo Picker Enhancement: group by day, month, year, size, and orientation
10. Add True & False Question quickly
11. Option to overwrite file when uploading to Google Drive
