Currently boostrap.js loads the atskin after all the core fwk files. It should not be the case, at least by default.
It doesn't make sense to load the skin when we require AT from Node.js. For instance, in the build-time skin normalization task, we load AT, which loads bootstrap, which loads the skin file.
This tasks involves removing the default loading, finding an alternative way, and documenting it properly in README in proper places (root of the repo, /src).
Removing the skin from bootstrap.js however creates a problem in widget test cases which require skin to work properly.
Depends on #427
Closed via 59e9ba7 in #427.