Option to use basic "legacy" CSS for transitions instead of CSS3 tranform

[JoryHogeveen]

• Slidebar library modifications: Use left, top, right and bottom css properties for animation
• Also prevents conflict with fixed elements because no transform property is used
• Unfortunately isn't as "smooth" as the CSS3 transitions

Reason:
I've tried for months to get it al working AND use the current transitions with hardware acceleration but this is simply impossible due to browser structure. Wherever you look, loads of people have the same problems when using fixed elements within elements that use the transform properties.
Only IE seems to do this as expected (weirdly enough...).

A lot of plugins and libraries for off-canvas elements use these "legacy" transitions so I though "heck, why not".