update Safari info per caniuse.com
editing for further clarity (websockets was not in Safari 4, for example)
Merge branch 'pr-280'
Added more recent references

Added link to Chris Coyier's "A Complete Guide to Flexbox" and Philip Walton's "Solved by Flexbox" - I wonder if any of the older links should be removed.
Merge pull request #282 from tinynow/patch-1

Added more recent references
Remove exceptions, all the modern browsers support calc() right now
Add exception for Android's native browser
Update browser compatibility
Change status from "caution" to "use", since all modern browsers support this feature
Change name to "css filters" to avoid confusion with SVG Filters
Add Opera into supported browsers list
Add Google Fonts reference
Add @supports post - Fixes #213
Compass sourcemap support

Sourcemaps working with `compass watch .` by using
the compass-sourcemap package.
Update input-range.md

Updating to reflect that Firefox 23+ not supports <input type="range">
Merge pull request #286 from webinista/patch-1

Update input-range.md
Update index.html
Add info on viewport unit bugs on iOS
Added direct link to issue description.
Expand iOS issue description