Glance quotas (#20)

* Add parameters for quota options

Quota options are parametrized. Each quota can be optionaly specified
otherwise default values are used. If parameter doesn't have value,
default value is used.

* Add Sample and test pillars

Add sample and test pillars for quota options.

* Conditionals on separate lines

* Add parameters also to pike config

* Reflect parameters rename in Sample and test pillars
diff --git a/README.rst b/README.rst
index 415c31f..7439a02 100644
--- a/README.rst
+++ b/README.rst
@@ -127,6 +127,21 @@
           virtual_host: '/openstack'
         ....
 
+Quota Options
+
+.. code-block:: yaml
+
+    glance:
+      server:
+        ....
+        quota:
+          image_member: -1
+          image_property: 256
+          image_tag: 256
+          image_location: 15
+          user_storage: 0
+        ....
+
 Configuring TLS communications
 ------------------------------