Openssl fix

In some cases, system ssl installations may cause the Infusionsoft gem to produce a ssl peer verify error because the ca_file is not in an expected location. Specifying the location of the ca_file as installed on the system will resolve this error.

This pull request adds a configuration option to add the ca_file location. If this option is added to the configuration file, the proper http variables will be set when making the connection with Infusionsoft servers.