Use listings package to add line numbers so we can explain an example
in section 7 better per referee #1 feedback.



git-svn-id: svn://svn.r-forge.r-project.org/svnroot/rprotobuf@905 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Minor cosmetic improvements suggested by Tim Hesterberg in code
review.



git-svn-id: svn://svn.r-forge.r-project.org/svnroot/rprotobuf@906 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
three small edits


git-svn-id: svn://svn.r-forge.r-project.org/svnroot/rprotobuf@907 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Improve example in section 7 using some of the specific advantages
suggested by referee #2 and point out why we've given the user a
simplified example and how it differs from the real MapReduce context
where this would be more useful.



git-svn-id: svn://svn.r-forge.r-project.org/svnroot/rprotobuf@908 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Add acknowledgements for Tim Hesterberg and two anonymous referees.



git-svn-id: svn://svn.r-forge.r-project.org/svnroot/rprotobuf@909 edb9625f-4e0d-4859-8d74-9fd3b1da38cb