Add cursive to LIBS_FROM_GIT

Allow cursive to be installed from git instead of pip.

The barbican-tempest-plugin, which uses cursive indirectly
through nova and glance, would benefit from the ability to
use cursive from git instead of pip.

Change-Id: Icae7d310f1ee392d080e7c8e421a26d7c0ef4727
diff --git a/stackrc b/stackrc
index 88f7541..56c19cd 100644
--- a/stackrc
+++ b/stackrc
@@ -483,6 +483,10 @@
 #
 ##################
 
+# cursive library
+GITREPO["cursive"]=${CURSIVE_REPO:-${GIT_BASE}/openstack/cursive.git}
+GITBRANCH["cursive"]=${CURSIVE_BRANCH:-master}
+
 # glance store library
 GITREPO["glance_store"]=${GLANCE_STORE_REPO:-${GIT_BASE}/openstack/glance_store.git}
 GITBRANCH["glance_store"]=${GLANCE_STORE_BRANCH:-master}