`options.excludeNodeModules` can now be set to `true` or to an Array containing
	modules to be excluded from the project
`options.allowUnresolvedModules` can now be set to `true` to ignore modules that
	could not be found.
`stats.unresolvedModules` contains information about modules that could not be
	found.  Only relevant when `options.allowUnresolvedModules` is `true`.
Better normalization of `options` in stream constructor
Push to 2.1.0