Incremented to vresion 1.8.6.

NAMESPACE now has a note that this was generated by roxygen2.

Added arguments to `knit2wp` to allow for editing (overwriting) pages rather than just creating new pages.  Also changed `getFromNamespace` to `do.call` as this allows more felxibiliy that is now needed for allowing editing.
roxygen2 reformatted all the help files.  Sorry that this happened, but it occured automatically during the package build.