Use semantic linebreaks; make two sentences more specific

[Semantic linebreaks](http://rhodesmill.org/brandon/2012/one-sentence-per-line/) allow more natural text wrapping, easier editing, better diffs, and an improved way to read the source.

Also, mention that ovirt is a customized instance of Strapping, and make it explicit that the open wiki model is MediaWiki's default.
Merge pull request #5 from waldir/patch-1

Use semantic linebreaks; make two sentences more specific