Implementation of the new API mechanism + tests

With the new Allocine API needs the query to be signed. So I added a new
method to build the query with the signature algorithm.
Also adding some tests to improve coverage.

modules/allocine/test.py

@@ -18,40 +18,69 @@
 # along with weboob. If not, see <http://www.gnu.org/licenses/>.
 
 from weboob.tools.test import BackendTest
-
+import re
 
 class AllocineTest(BackendTest):
     BACKEND = 'allocine'
 
     def test_search_movie(self):
         movies = list(self.backend.iter_movies('spiderman'))
+        assert len(movies) > 0
         for movie in movies:
             assert movie.id
 
     def test_get_movie(self):
         movie = self.backend.get_movie('5032')
+        assert movie
         assert movie.id
         assert movie.original_title
 
     def test_search_person(self):
         persons = list(self.backend.iter_persons('dewaere'))
+        assert len(persons) > 0
         for person in persons:
             assert person.id
 
     def test_get_person(self):
-        person = self.backend.get_person('1116')
+        person = self.backend.get_person('1115')
+        assert person
         assert person.id
         assert person.name
         assert person.birth_date
 
     def test_movie_persons(self):
         persons = list(self.backend.iter_movie_persons('5032'))
+        assert len(persons) > 0
         for person in persons:
             assert person.id
             assert person.name
 
     def test_person_movies(self):
         movies = list(self.backend.iter_person_movies('1115'))
+        assert len(movies) > 0
         for movie in movies:
             assert movie.id
             assert movie.original_title
+
+    def test_get_person_biography(self):
+        bio = self.backend.get_person_biography('1115')
+        assert bio != ''
+        assert bio is not None
+        assert re.match(r'^Patrick Dewaere, fils.*', bio)
+
+    def test_get_movie_releases(self):
+        rel = self.backend.get_movie_releases('5032', 'fr')
+        assert rel != ''
+        assert rel is not None
+
+    def test_iter_person_movies_ids(self):
+        movies_ids = list(self.backend.iter_person_movies_ids('1115'))
+        assert len(movies_ids) > 0
+        for movie_id in movies_ids:
+            assert movie_id
+
+    def test_iter_movie_persons_ids(self):
+        persons_ids = list(self.backend.iter_movie_persons_ids('5032'))
+        assert len(persons_ids) > 0
+        for person_id in persons_ids:
+            assert person_id