Updated README using color values greater than 1.0f. fixes #10

Updated README colorWithRed:... using values greater than 1.0f. fixes #10
Merge pull request #22 from Ashton-W/patch-1

Updated README using color values greater than 1.0f. fixes #10
Added info about interface idiom branching.
Media Query support

Similar to CSS, media query support in UISS allows you to have layouts
specific to various device configurations (e.g.: iPhone 4 vs 5). This
code is also extensible to allow for additional properties (e.g.:
device-version: 6, device-version: 7) in the future.

Since UISS files are evaluated once at runtime, media queries can only
be used to evaluate device-specific properties.
Try the easy way out when searching for selectors

Searching for selectors is highly expensive (on our app, we spend 14.7
seconds on iPhone 3GS doing this), and we see massive performance gains
if we first try the most common pattern. With this fix, load time is
shaved by over 10 seconds.
Allow os-version in media queries
Media query should only match major version
Attempt to simply capture *:forState: selectors too

Yields a significant performance improvement (1600ms to 300ms) on older
devices with large UISS.json files (~2000 lines).