unify our way of handling different line breaks at different platforms

git-svn-id: svn://svn.code.sf.net/p/htmlunit/code/trunk@8847 5f5364db-9458-4db8-a492-e30667be6df6
ups

git-svn-id: svn://svn.code.sf.net/p/htmlunit/code/trunk@8848 5f5364db-9458-4db8-a492-e30667be6df6