Initial implementation of class responsible for
resolving extensions (that is, loading modules
associated with defined extensions.)
Also, add methods to Bundle and Extension classes
to support logging performed during the extension
resolution phase. WTD-518.
Begin work on extension resolution phase of
the framework layer. WTD-518.
Introduce an implementation loader which wraps
RequireJS, and a skeleton class for extension
resolution.
Continue implementing classes which represent fundamental
concepts within the framework layer. WTD-518.
In particular, add methods which will be useful during the
extension resolution phase of framework start up.
