Updated readme with info on autoprefixer need

Plus introductory information on supporting old web browsers.

README.md

@@ -6,6 +6,8 @@ SpinKit uses CSS animations to create smooth and easily customizable animations.
 
 ## Usage
 
+### Regular CSS
+
 Grab the HTML and CSS for a spinner and include it in your project. Note that a hidden spinner (`opacity: 0`, or `visibility: hidden`) will still animate. After hiding a spinner, it's recommended to remove it from the DOM, set `display: none` or pause the animation by setting `animation-play-state: paused`.
 
 SpinKit can also be installed to your project with `bower`:
@@ -14,15 +16,23 @@ SpinKit can also be installed to your project with `bower`:
 $ bower install spinkit
 ```
 
+### SCSS
+
 If you're using SCSS in your project then you can include just the styles for the spinners that you want by adding the following to your main file:
 
 ```scss
 @import '../bower_components/spinkit/scss/spinners/1-rotating-plane',
         '../bower_components/spinkit/scss/spinners/3-wave';
 ```
 
+Please note that you currently need to use [autoprefixer](https://github.com/postcss/autoprefixer) in your project if you want to support all browsers. If you're compiling your SCSS with gulp you can use [gulp-autoprefixer](https://github.com/sindresorhus/gulp-autoprefixer) or if you use grunt then [grunt-autoprefixer](https://github.com/nDmitry/grunt-autoprefixer) is a good choice.
+
 There are some variables that can be overridden if you use SCSS. The defaults are listed in [scss/_variables.scss](https://github.com/tobiasahlin/SpinKit/blob/master/scss/_variables.scss).
 
+## Old web browser compatibility
+
+With support for CSS animations in every current browser and [almost 90% of all browsers in use today](http://caniuse.com/#feat=css-animation), the need for GIF and JavaScript fallbacks is decreasing quickly. If you still need to support those last few then this section is for you.
+
 ### Implementing a fallback spinner
 
 An easy way to provide a fallback animation is to check for support for the `animation` property, and replace the spinner with a GIF if it's not supported.