Update composer.json

Added dev dependency
Fixed issue with parsing of all nodes match.
detect recursive mixins
popEnv after compiling/flattening selectors
Use argument inspection to detect native filter effects (grayscale, opacity, invert, saturate)
Merge pull request #44 from robocoder/recursive-mixins

detect recursive mixins
Merge pull request #32 from guilhermeblanco/master

Fixed bug with all match selectors
Merge pull request #43 from robocoder/interpolation-at-root

popEnv after compiling/flattening selectors
Merge pull request #42 from robocoder/filters

Use argument inspection to detect native filter effects
return null to abort builtin