Fix chart rendering when annotations specified

Commit 70b2777 caused user-provided
annotations to break the `checksum` StatefulSet annotations. The
`{{ with .Values.annotations }}` instruction changes the scope
under which the checksum is calculated when user annotations are present.

This removes the `{{ with .Values.annotations }}` and instead just
writes out the user-provided annotations directly.

I've also added a user-provided annotation to the `values.yaml` used
in the smoke test to verify the fix.

Fixes #37

couchdb/ci/required-values.yaml

@@ -1,3 +1,5 @@
 couchdbConfig:
   couchdb:
     uuid: "decafbaddecafbaddecafbaddecafbad"
+annotations:
+  foo: bar

couchdb/templates/statefulset.yaml

@@ -18,10 +18,10 @@ spec:
     metadata:
       labels:
 {{ include "couchdb.ss.selector" . | indent 8 }}
-{{- with .Values.annotations }}
       annotations:
         checksum/config: {{ include (print $.Template.BasePath "/configmap.yaml") . | sha256sum }}
-{{ toYaml . | indent 8 }}
+{{- if .Values.annotations }}
+{{ toYaml .Values.annotations | indent 8 }}
 {{- end }}
     spec:
       {{- if .Values.schedulerName }}