bootstrap.offcanvas.scss - fixing browser prefixes

[transbetty]

Issue
1.4.2 ver doesn't work properly in iOS if you use SASS.

Reason
It's because the SASS source file doesn't include browser prefixes.

Example
bootstrap.offcanvas.scss line 31: transform: translateX($offcanvas-width);

Fix
use Compass to add all browser prefixes: @include transform(translateX($offcanvas-width));

[iamphill]

I don't really want to add this into the main repo for 2 reasons:

• Compass is very slow to compile and requires Ruby - whereas all the deps that are required at the moment are JavaScript and fast.
• if you build the CSS through the library itself (it is just an add-on to Bootstrap's CSS after all) auto-prefixer does all the vendor prefixing for you 😄

But if you need this for a project you are working on then by all means edit your local source for this 👍