v1.4.0

Added

• Lasso and rectangular selection interactions for scatter-marker and scatter-text traces [#154, #169]
• Un-gitignore css and svg font built files, removing post-install step and
  dependency on node-sass [#164]

Changed

• Clean up Pie, Box and Choropleth trace module [#158, #159, #165]

Fixed

• Surface traces correctly handle zmin and zmax attributes [#153]
• Pie trace correctly trigger hover events [#150]