patternfly-react introduced react wrappers around Chart components.
It means we can remove our implementation for charts and switch to the patternfly-react implementation.

Charts pr:
https://github.com/patternfly/patternfly-react/pull/103

Charts storybook:
https://rawgit.com/patternfly/patternfly-react/gh-pages/index.html?knob-Label=Danger%20Will%20Robinson%21&selectedKind=Chart&selectedStory=Area%20Charts&full=0&down=1&left=1&panelRight=0&downPanel=storybooks%2Fstorybook-addon-knobs