LIBFCREPO-114. Client cert authentication.
LIBFCREPO-114. Client cert authentication.

Added client certificate authentication that takes precedence over username and password authentication. Set the CLIENT_CERT and CLIENT_KEY values in the config file and Requests will use those files as the request certificate and key.

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

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