test for image download added

git-svn-id: svn://svn.code.sf.net/p/htmlunit/code/trunk@9460 5f5364db-9458-4db8-a492-e30667be6df6
more test for image width/height

git-svn-id: svn://svn.code.sf.net/p/htmlunit/code/trunk@9461 5f5364db-9458-4db8-a492-e30667be6df6
ie11 expectations added

git-svn-id: svn://svn.code.sf.net/p/htmlunit/code/trunk@9462 5f5364db-9458-4db8-a492-e30667be6df6