Randomize monster speech, and a few new lines.

Also added Polyphemus' speech while I was at it (courtesy of freakingretard).

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@7656 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on November 27, 2008
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