3.6.0 [RC5]

- Primitive bootstrap support - modal windows #449
- railposition outside a fixed div in Chrome 38 and IE not correct #450
- Preserve Vertical scroll behavior after horizontal scrolling ends #451
- Wrapped divs, fix rail position for content already scrolled
- Detect content appends to page, refresh rail positions
- Initial code rewriting to detach legacy browser support for current
code