fix i18ndude installation: it has to be done after Plone dependencies…

… are installed to avoid version conflicts

Makefile

@@ -6,14 +6,16 @@ options = -N -q -t 3
 
 prerequisites:
 	sudo apt-get install -qq pep8 pyflakes
-	pip install i18ndude --use-mirrors
 	mkdir -p buildout-cache/downloads
 
+i18ndude:
+	pip install i18ndude --use-mirrors
+
 install: prerequisites
 	python bootstrap.py -c travis.cfg
 	bin/buildout -c travis.cfg $(options)
 
-tests:
+tests: i18ndude
 	bin/test
 	pyflakes src/
 	pep8 --ignore=$(pep8_ignores) src/