Add documentation

Pivot table

Hot reloading of React modules!

Upgrade frontend dependencies + misc cleanup

update pivot implementation to handle all the pivoting logic inside the VisualizationTable component and lessen the work inside the Visualization wrapper.

Merge branch 'update_docs' of github.com:danielledalton/metabase-init into danielledalton-update_docs

Update administration-guide.md

Update users-guide.md

Conflicts:
	package.json

Conflicts:
	resources/frontend_client/app/query_builder/add_to_dashboard_popover.react.js

Add npm-shrinkwrap file to lock down dependencies. Update using 'npm shrinkwrap --dev' when adding/upgrading dependencies.