feat(graphs.graph) Adds comprehensive tooltip for graph
test(mixins.highlight) Adds tests for comprehensive tooltip
fix(mixins.highlight) Fixes var references and removes return
fix(mixins.highlight) Handles the hidden data sources in ttooltip
refactor(graphs.graph) Moves tooltip configuration to update and adds showHighlight config prop for components
fix(components.line) Removes tooltip for individual component
Merge pull request #211 from racker/tooltip-enhancement

feat(graphs.graph) Adds comprehensive tooltip for graph (ready)