Unify plugins

[curran]

The three plugins that currently exist (bar chart, line chart, scatter plot) must be unified in their implementation approach. Issues that need to be addressed include:

• Reactivis should be consistently used for defining X and Y axes
• Reactivis should be consistently used for defining Color
• Public properties should be consistently declared (appended to model.publicProperties) and given a default value close to the reactive function that uses them

After this refactoring, these three plugins will serve as canonical plugin examples to guide development of future D3-based plugins.

[curran]

Perhaps this can take some inspiration from the API for Backbone Models. Here's how to extend a Backbone Model (from http://backbonejs.org/#Model ):

var Sidebar = Backbone.Model.extend({
  promptColor: function() {
    var cssColor = prompt("Please enter a CSS color:");
    this.set({color: cssColor});
  }
});

Wouldn't it be cool if one could create a new Chiasm plugin by extending some kind of "Chiasm plugin base" thing that specifies a simple API for visualization components.

[curran]

Done in Fundamental Visualizations and chiasm-component.