deprecated api calls

[akaRem]

Essential React listening at http://:::8080
Container#eachAtRule is deprecated. Use Container#walkAtRules instead.
Container#eachRule is deprecated. Use Container#walkRules instead.
Container#eachDecl is deprecated. Use Container#walkDecls instead.
Node#before is deprecated. Use Node#raws.before
Node#removeSelf is deprecated. Use Node#remove.

[akaRem]

$ node -v
v4.2.1
$ npm -v
2.14.7