updating issue #24 adding edit_wiki test capability
Merge branch 'wiki-tests-issue-24' into wiki-test-ready-for-review
updating test name.
moving _edit_text_entered out of page object & into test as per @bobsilverberg comments.
adding timestamp to texted entered to verify text is actually changed.
Merge pull request #36 from glennhoward/wiki-test-ready-for-review

Taking over issue #26 which will close off issue #24.