Add a test for document.images.
Address some comments about the document.images test.
Split up tests for document.images.
Add a test for the textContent setter.
Address review comments about textContent.
Call abort() from onloadstart to avoid send() throwing InvalidStateError
Correct URL composition part
Merge pull request #352 from jungkees/xhrfix

XMLHttpRequest test fixes
Merge pull request #321 from Ms2ger/textcontent-setter

Add a test for the textContent setter.
Merge pull request #246 from Ms2ger/document-images

Add a test for document.images.