ENH: Updated MovieStim2.py demo

- uses .mov included in folder.
- replaced textbox with textstim

Looping is turned off in demo, as it stalls this video at end and does not loop ( user can press q to quit if they do enable looping). Not fixing looping for this video right now as this is the only video I have tested where the looping fails (I have only tested 10 videos though).If becomes a big issue will spend more time to fix.

When I tried reencoded video it would play in VLC and moviestim2  but not in Windows media player, so it maybe unstable. No point replacing a video with possible issues with another version that has issues, but happens to work with moviestim2. ;)