Add example configuration

.env.example

@@ -44,3 +44,27 @@ API_SECRET=password
 #GOOGLE_OAUTH_REDIRECT=http://ninja.dev/auth/google
 
 #GOOGLE_MAPS_API_KEY=
+
+#S3_KEY=
+#S3_SECRET=
+#S3_REGION=
+#S3_BUCKET=
+
+#RACKSPACE_USERNAME=
+#RACKSPACE_KEY=
+#RACKSPACE_CONTAINER=
+#RACKSPACE_REGION=
+
+#RACKSPACE_TEMP_URL_SECRET=
+
+# If this is set to anything, the URL secret will be set the next
+# time a file is downloaded through the client portal.
+# Only set this temporarily, as it slows things down.
+#RACKSPACE_TEMP_URL_SECRET_SET= 
+
+#DOCUMENT_FILESYSTEM=
+
+#MAX_DOCUMENT_SIZE # KB
+#MAX_EMAIL_DOCUMENTS_SIZE # Total KB
+#MAX_ZIP_DOCUMENTS_SIZE # Total KB (uncompressed)
+#DOCUMENT_PREVIEW_SIZE # Pixels