package_data was missing the .txt files in the testing directories. This was causing

the test suite to fail when IPtyhon was installed.  I have modified find_package_data
in setupbase.py to include these files.  Anyone who writes tests that rely on .txt 
files needs to add them to the package_data.

setupbase.py

@@ -124,7 +124,11 @@ def find_package_data():
     """
     # This is not enough for these things to appear in an sdist.
     # We need to muck with the MANIFEST to get this to work
-    package_data = {'IPython.UserConfig' : ['*'] }
+    package_data = {
+        'IPython.UserConfig' : ['*'],
+        'IPython.tools.tests' : ['*.txt'],
+        'IPython.testing' : ['*.txt']
+    }
     return package_data