Ftw.testbrowser

-------------------

- Fix error with textarea tags without id-attributes.
[jone]

-------------------

- Fix an issue with relative urls.
[jone, deiferni]

-------------------

- Set the HTTP ``REFERER`` header correctly.
[jone]

-------------------


- Add folder_contents page object.
[jone]

- Update table methods with keyword arguments:

- head_offset: used for stripping rows from the header
- as_text: set to False for getting cell nodes

[jone]

-------------------

- Filling selects: verbose error message when option not found.
The available options are now included in the message.
[jone]

-------------------

- Node.text: remove multiple spaces in a row caused by nesting.
[jone]