Add JSDoc comments to Action Aggregator to satisfy code standards in the platform/core bundle, for WTD-573.
Bring in bundle platform/core from the sandbox branch, in preparation for clean up, tests, and integration. WTD-573
Add general structure for Open MCT Web, including top-level and second-level directory structure. README files are included to explain the role of each directory; markdown is used to allow for richer display when viewer support is present. WTD-519.
