packrat::bundle() does not generate valid bundle in packrat 0.4.1-1 under Windows 7 x64, R 3.1.1

Thanks for the great work on packrat! I'd really like to use this package to create reproducible research.
Consequently, I've tried to bundle() my project on two different Windows 7 x64 machines with R 3.1.1 x64 and packrat version 0.4.1-1 installed, but the generated .tar.gz file unfortunately does not contain all necessary files. Only the package source files are present, but all other folders and files (such as init.R and .Rprofile) are not present when comparing it to the .tar.gz archive generated on a Linux machine with R 3.1.1 and packrat 0.4.1-1). As a consequence, packrat::unbundle() throws an error on the Windows-generated archive:

• Restoring project library...
  Error: This project has not yet been packified.
  Run 'packrat::init() to init packrat.

It would be very helpful if this could be fixed, so I can recommend the paper to my colleagues who only use Windows.

Reproduce packrat::bundle() on Windows 7 x64 with R 3.1.1 and packrat 0.4.1-1, then compare the generated .tar.gz with the Linux archive. Check that project files such as init.R and .Rprofile are included and that packrat::unbundle() restores the project without the packification error.