doc: add 0.8 version to master branch

When 0.8 documents are published, we create a link to them from the
master branch where the /latest version of documentation is found.

Signed-off-by: David B. Kinder <david.b.kinder@intel.com>

doc/conf.py

@@ -189,13 +189,10 @@ else:
 html_context = {
    'current_version': current_version,
    'versions': ( ("latest", "/latest/"),
+                 ("0.8", "/0.8/"),
                  ("0.7", "/0.7/"),
                  ("0.6", "/0.6/"),
                  ("0.5", "/0.5/"),
-                 ("0.4", "/0.4/"),
-                 ("0.3", "/0.3/"),
-                 ("0.2", "/0.2/"),
-                 ("0.1", "/0.1/"),
                )
     }