Added script to confirm API docs up-to-date.

ci/check_swagger_sync.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+
+$GOPATH/bin/swag init --generalInfo bridge/api/api.go --dir . 2> /dev/null
+
+# When regenerated, only a single date line changes.
+# A minimal one-line diff shows as two operations (addition + subtraction),
+# with 7 lines in the diff output
+if [ "$(git diff --unified=0 | wc -l)" -gt 7 ]; then
+  exit 1
+fi