Autopilot Testcase Needed: list of available documents

[Stefano Verzegnassi]

With revision 86, a list of documents (which are stored in [HOME]/Documents) is shown instead of the default empty state.
We need to test whether documents are properly added or removed in/from the list.

NOTE:
 * Only files with "application/pdf" and "text/*" mime types are supported.
 * If no document is available, the empty state should be shown
 * The documents model is updated in real-time, as the content of [HOME]/Documents changes
 * QFileInfo.lastRead() [1] is used to get the date of the document. Ensure that it is correctly displayed and listed under the right section (e.g. "Last week", "Yesterday", etc.).

[1] http://qt-project.org/doc/qt-4.8/qfileinfo.html#lastRead