removed postgresql requirement

chart/requirements.lock

-dependencies:
-- name: postgresql
-  repository: https://kubernetes-charts.storage.googleapis.com/
-  version: 0.7.1
-digest: sha256:358ce85fe4d3461ea6bb96713470a80de9c1324214a2e6f97d800298c02530e2
-generated: 2017-08-28T15:22:30.690341342-05:00

chart/requirements.yaml

-dependencies:
-  - name: postgresql
-    version: "0.7.1"
-    repository: "https://kubernetes-charts.storage.googleapis.com/"
-    condition: postgresql.enabled

chart/templates/db-initialize-job.yaml

-{{- if .Values.application.initializeCommand -}}
-apiVersion: batch/v1
-kind: Job
-metadata:
-  name: {{ template "trackableappname" . }}-db-initialize
-  labels:
-    app: {{ template "appname" . }}
-    chart: "{{ .Chart.Name }}-{{ .Chart.Version| replace "+" "_" }}"
-    release: {{ .Release.Name }}
-    heritage: {{ .Release.Service }}
-  annotations:
-    "helm.sh/hook": post-install
-    "helm.sh/hook-delete-policy": before-hook-creation
-    "helm.sh/hook-weight": "0"
-spec:
-  template:
-    metadata:
-      labels:
-        app: {{ template "appname" . }}
-        release: {{ .Release.Name }}
-    spec:
-      restartPolicy: Never
-      imagePullSecrets:
-{{ toYaml .Values.image.secrets | indent 10 }}
-      containers:
-      - name: {{ .Chart.Name }}
-        image: "{{ .Values.image.repository }}:{{ .Values.image.tag }}"
-        command: ["/bin/sh"]
-        args: ["-c", "{{ .Values.application.initializeCommand }}"]
-        imagePullPolicy: {{ .Values.image.pullPolicy }}
-        {{- if .Values.application.secretName }}
-        envFrom:
-        - secretRef:
-            name: {{ .Values.application.secretName }}
-        {{- end }}
-        env:
-        - name: DATABASE_URL
-          value: {{ .Values.application.database_url | quote }}
-{{- end -}}

chart/templates/db-migrate-hook.yaml

-{{- if .Values.application.migrateCommand -}}
-apiVersion: batch/v1
-kind: Job
-metadata:
-  name: {{ template "trackableappname" . }}-db-migrate
-  labels:
-    app: {{ template "appname" . }}
-    chart: "{{ .Chart.Name }}-{{ .Chart.Version| replace "+" "_" }}"
-    release: {{ .Release.Name }}
-    heritage: {{ .Release.Service }}
-  annotations:
-    "helm.sh/hook": pre-upgrade
-    "helm.sh/hook-delete-policy": before-hook-creation
-    "helm.sh/hook-weight": "0"
-spec:
-  template:
-    metadata:
-      labels:
-        app: {{ template "appname" . }}
-        release: {{ .Release.Name }}
-    spec:
-      restartPolicy: Never
-      imagePullSecrets:
-{{ toYaml .Values.image.secrets | indent 10 }}
-      containers:
-      - name: {{ .Chart.Name }}
-        image: "{{ .Values.image.repository }}:{{ .Values.image.tag }}"
-        command: ["/bin/sh"]
-        args: ["-c", "{{ .Values.application.migrateCommand }}"]
-        imagePullPolicy: {{ .Values.image.pullPolicy }}
-        {{- if .Values.application.secretName }}
-        envFrom:
-        - secretRef:
-            name: {{ .Values.application.secretName }}
-        {{- end }}
-        env:
-        - name: DATABASE_URL
-          value: {{ .Values.application.database_url | quote }}
-{{- end -}}