fix deprecation message for rules, decls & list.
Merge pull request #129 from postcss/fix-deprecated-notice

fix deprecation message for rules, decls & list.
Update sourcemap example with latest change (postcss 3)

Not sure if it's okay this way, but the current example is not right.
Merge pull request #130 from postcss/fix.sourcemap-example

Update sourcemap example with latest change (postcss 3)
Fix code styles
Move summary.js to gulp-bench-summary lib
Better isNaN check
Update dependencies
Release 3.0.1 version
Fix empty comment parsing
Fix Root normalize in some cases
Update 6to5 compiler
Release 3.0.2 version
Add doiuse plugin ro README.md