Retrofit React into existing bundle

- browserify is a dependency for concat task, to contain the
table_with_react bundle
- table_with_react contains a Backbone override, to overwrite the
existing cdb.admin.TableView with one that acts as init point for the
React Table component.
Replicate header view as a React component, as-is

Still missing interaction though and some parts should probably be
rendered as local state rather than private functions in the render
calls