This cause the error "Mismatched anonymous define" when loading the
bundle in Plone.
The original reason for adding `start.frag` was to wrap the bundle in a
closure to not pollute the global namespace (e.g. overriding global
`define` and `require` with Almond`s versions) and secondarily to allow
people to load the bundle via require.js.
The second usecase should now probably be done via a shim in the
require.js config.
Builds are now themselves UMD modules, so they could be `require`'d like any
other AMD module or they can still be used as old ES5 modules with globals.
Additionally the build is now closured, so that the almond API doesn't pollute
the global context with `define` or `require`. This does however mean that
`require` can no longer be used outside of the build (unless requirej.s is
included directly.
