Feature: Flash Video onebox, set dimension via url using #WxH

```
http://example.com/file.swf#640x360 // width 640px height:360px
http://example.com/file.swf#0x360   // width 100% height:360px
http://example.com/file.swf#640x0   // width 640px height:100%
```
This comment isn't very usefull. Author's information is kept in git, no need to duplicate it in the code.