Added rollout_callback, inverse of rollover_callback; For want of a better name...
Rebuilt with updates
Replacing rollover_callback and rollout_callback with mouseover and mouseout
Added deprecation warning utility method; Added warnings for callbacks
Adding stack trace to the deprecation warning; Aliasing deprecated params to their replacements if necessary
Adding mousemove callback
Added callback tests for bar charts
Setting up helpers for cross-module testing
Merge pull request #239 from dandehavilland/rollout-callback

Added rollout_callback, inverse of rollover_callback