Some robotsuite weirdness (tl;dr)

I've been using version robotsuite 1.2.2 with no issues. Today
suddenly I can't run tests. After debugging, I find that robotsuite is
trying to create a path using a `TestCaseFile` object, resulting in
this path:

```python
(Pdb) path
u"/home/jean/zope/plomino/parts/test/<Unrepresentable object
'TestCaseFile'. Error: TypeError: coercing to Unicode: need string or
buffer, TestCaseFile found>"
```

This patch fixed it:

```diff
diff --git a/src/robotsuite/__init__.py b/src/robotsuite/__init__.py
index bb6031f..6f75a83 100644
--- a/src/robotsuite/__init__.py
+++ b/src/robotsuite/__init__.py
@@ -221,7 +221,7 @@ class RobotTestCase(unittest.TestCase):
         recurse(suite, self, suite_parent)

         # Set suite to be run bu runTest
-        self._robot_suite = suite
+        self._robot_suite = filename
         # Set outputdir for log, report and screenshots
         self._robot_outputdir = outputdir
         # Set test method name from the test name
```

I have no idea why it worked before and went screwy.

Upgrading to 1.4.0 fixed it.

Posting to the list to vent and in case anyone else runs into this.

-- 
jean                                              . .. .... //\\\oo///\\

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