Start a "base" recipe

This probably needs to have a "pages" templates too.

tools/boilerplate_data/base_backend.py

@@ -0,0 +1,18 @@
+<%inherit file="layout.py"/>
+from weboob.tools.backend import BaseBackend
+
+from .browser import ${r.classname}Browser
+
+
+__all__ = ['${r.classname}Backend']
+
+
+class ${r.classname}Backend(BaseBackend):
+    NAME = '${r.name}'
+    DESCRIPTION = '${r.name} website'
+    MAINTAINER = '${r.author}'
+    EMAIL = '${r.email}'
+    VERSION = '${r.version}'
+
+    DOMAIN = 'www.${r.name}.com'
+    BROWSER = ${r.classname}Browser