fixes issue ZF-5256.  checkbox value converted to string like checkedOptions are. also fixed bug with determineCheckboxInfo.  was using wrong index for checked/unchecked values.
fixes issue ZF-5256.  checkbox value converted to string like checkedOptions are. also fixed bug with determineCheckboxInfo.  was using wrong index for checked/unchecked values.

git-svn-id: abaeb2b3ba5a94ed391a9405ad7d63d0414021c9@18627 44c647ce-9c0f-0410-b52a-842ac1e357ba

tjohns/zf,svn2github/zend_framework,tjohns/zf,svn2github/zend_framework,jupeter/zf1,tjohns/zf,jupeter/zf1,svn2github/zend_framework,svn2github/zend_framework,jupeter/zf1,svn2github/zend_framework