Pages: Add optional path argument to Plone.visit_portal.
Pages: Normalize text in Plone.get_first_heading.
Pages: Remove Plone.disable_wysiwyg_for_field: not used anymore.

Use fill_field of the form page object. This handles tinymce.
Pages: Handle tinymce in fill_field for PhantomJS.
Pages: add traceback informations for easier debugging.
Pages: Add Plone page object test.
Pages: add concat_portal_url helper method.
Pages: improve docstrings.
Pages: add tests for plone control panel page object.
Update readme with splinter / page objects.