Add title and description parameters to generate doc

hapic/doc.py

         self,
         controllers: typing.List[DecoratedController],
         app,
+        title: str='',
+        description: str='',
     ) -> dict:
         # TODO: Découper, see #11
         # TODO: bottle specific code !, see #11
         flatten = lambda l: [item for sublist in l for item in sublist]
 
         spec = APISpec(
-            title='Swagger Petstore',
+            title=title,
+            description=description,
             version='1.0.0',
             plugins=[
                 'apispec.ext.bottle',

hapic/hapic.py

             return decoration.get_wrapper(func)
         return decorator
 
-    def generate_doc(self, app):
+    def generate_doc(self, app, title: str='', description: str=''):
         # FIXME: j'ai du tricher avec app, see #11
         # FIXME @Damien bottle specific code ! see #11
         # rendre ca generique
         app = app or self._context.get_app()
         doc_generator = DocGenerator()
-        return doc_generator.get_doc(self._controllers, app)
+        return doc_generator.get_doc(
+            self._controllers,
+            app,
+            title=title,
+            description=description,
+        )