randomtext by ovvy

I think `randomtext` is ready but some verification is probably a good idea.

Suggested testing procedure:
```
rsshell

# if you don't have ovvy yet:
git remote add -f ovvy git://github.com/ovvy/the-red-spider-project.git
# otherwise:
git fetch ovvy

git checkout ovvy/rtext

./setup.py  # yes, install

rshelp randomtext  # should show a short usage line

randomtext Readme.md 1000 work/test.txt  # should produce a file with 1000 randomly arranged words
# you might need to replace the / by a \ on Windows

# restoring your previously installed commands:
git checkout master
./setup.py

exit  # from rsshell
```