Factor out chiasm-runtime, make a "default build"

[curran]

This repository contains the core runtime environment of Chiasm, but what it really represents is the "Chiasm Project" itself, which encompasses the modules under https://github.com/chiasm-project. These modules include:

• chiasm-injector - Injects Chiasm components into existing DOM elements.
• chiasm-layout - Nested box layout for Chiasm components.
• chiasm-links - Data binding between Chiasm components.
• chiasm-dataset-loader - A Chiasm component that fetches datasets over HTTP.
• chiasm-charts - Reusable data visualization components.
• chiasm-crossfilter - A Chiasm component for Crossfilter.js.
• chiasm-data-reduction - A Chiasm component for aggregation and filtering.
• chiasm-dataset - A data structure for representing tabular data.
• chiasm-svgsaver - A Chiasm component for saving SVG data.
• chiasm-component - A common base for Chiasm components.

It would be nice to have a single Chaism bundle that one could use as a monolithic library that includes all of these modules. This is similar to D3 in that the modules can be maintained separately, but they come together to form releases of the top-level library, d3.js.

Examples would be much simpler (no Chiasm boilerplate with plugin assignment necessary).

At least a POC of this should be done, just to see how large the resulting library is. If it's too large (from bundling Crossfilter and other dependencies), this idea may not be practical. Maybe if this happens, there could be a subdivision of chiasm.js and chiasm-extras.js.