added staging-ca certificate and added verification test to travis config

.gitignore

@@ -3,4 +3,5 @@ domains.txt
 config.sh
 certs/*
 !certs/lets-encrypt-x1-cross-signed.pem
+!certs/lets-encrypt-staging.pem
 .acme-challenges/*

.travis.yml

@@ -15,9 +15,11 @@ before_script:
   - if [[ -z "${TMP_URL}" ]]; then exit 1; fi
   - echo 'CA="https://acme-staging.api.letsencrypt.org/directory"' > config.sh
   - echo 'WELLKNOWN=".acme-challenges/.well-known/acme-challenge"' >> config.sh
+  - echo 'ROOTCERT="lets-encrypt-staging.pem"' >> config.sh
   - echo "${TMP_URL}" > domains.txt
 
 script:
   - ./letsencrypt.sh
   - openssl x509 -in "certs/${TMP_URL}/cert.pem" -noout -text
+  - openssl verify -verbose -CAfile "certs/${ROOTCERT}" -purpose sslserver "certs/${TMP_URL}/cert.pem"
   - ./letsencrypt.sh revoke "certs/${TMP_URL}/cert.pem"

certs/lets-encrypt-staging.pem

+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----