Change PyDev project version to "python 2.6"

Repo is dropping support for Python <2.5 soon, so this updates the
PyDev configuration appropriately.

Change-Id: If327951e3a9fd9ff7513b931bfcfe6172dc8e4c5

.pydevproject

@@ -5,6 +5,6 @@
 <pydev_pathproperty name="org.python.pydev.PROJECT_SOURCE_PATH">
 <path>/repo</path>
 </pydev_pathproperty>
-<pydev_property name="org.python.pydev.PYTHON_PROJECT_VERSION">python 2.4</pydev_property>
+<pydev_property name="org.python.pydev.PYTHON_PROJECT_VERSION">python 2.6</pydev_property>
 <pydev_property name="org.python.pydev.PYTHON_PROJECT_INTERPRETER">Default</pydev_property>
 </pydev_project>