rst2odt: Add WR Style

I had this pointing at $HOME/Ubuntu One/... but the intent was for this
project to be self-contained.  So fix that.  Kind of a problem, though,
since .gitignore includes .odt files and 'make clean' will blow away the
.odt files as well.  So we had to do a bit of a workaround.
wr-style.oostyle is actually just an odt and can be edited and saved by
oowriter / libreoffice writer.

Signed-off-by: Joe MacDonald <joe.macdonald@windriver.com>