📝 support scm_host in installation.rst.jj2

Also fix when release is 0.0.0 and support projects
without a setup.py

templates/installation.rst.jj2

@@ -1,3 +1,6 @@
+{% if not scm_host %}
+{% set scm_host = 'github.com' %}
+{% endif %}
 {% if release != '0.0.0' %}
 
 You can install {{name}} via pip:
@@ -8,10 +11,14 @@ You can install {{name}} via pip:
 
 
 or clone it and install it:
+{% else %}
+You can get it:
 {% endif %}
 
 .. code-block:: bash
 
-    $ git clone https://github.com/{{organisation}}/{{name}}.git
+    $ git clone https://{{scm_host}}/{{organisation}}/{{name}}.git
     $ cd {{name}}
+{% if setup_py != False %}
     $ python setup.py install
+{% endif %}