LIBFCREPO-114. Add server certificate verification.
LIBFCREPO-114. Add server certificate verification.

For testing on repos with self-signed certificates (e.g., fcrepo-vagrant), added a SERVER_CERT config option to specify the server cert for Requests to trust when making HTTPS connections to the repository.

https://issues.umd.edu/browse/LIBFCREPO-114

peichman-umd/newspaper-batchload,jwestgard/newspaper-batchload,umd-lib/newspaper-batchload,jwestgard/newspaper-batchload,umd-lib/newspaper-batchload,peichman-umd/newspaper-batchload