New Version 2.6.4 Updated

1. Solved the frame rate bugs which caused time shorten, frame loss, black screen, etc during video exporting.
2. Text Optimization: More preset text animation; Text HTML supported, etc.
3. Undo, redo function optimization.
4. Filter optimization.
5. Improve interface for easier operation.
6. Solved the problem that "Moviemator can not be used in Mac10.10.4 system".