HtmlImage: close imageReader in finalize().
Issue 1541

git-svn-id: svn://svn.code.sf.net/p/htmlunit/code/trunk@8640 5f5364db-9458-4db8-a492-e30667be6df6
changes.xml: HttpClient 4.3.1

git-svn-id: svn://svn.code.sf.net/p/htmlunit/code/trunk@8641 5f5364db-9458-4db8-a492-e30667be6df6