Handle ConsString for JSON body in ScriptableHttpClient.

Currently a convert function in ScriptableHttpClient doesn't handle the
ConsString object. This patch fixes the module to handle it.
Make travis logs on the console only.

Currently travis also logs to the file and MongoDB, but it's useless.
Logging on the database.

Currently, beyond logs to the file and console. We need to save the log
on the mongodb.

This patch makes beyond depend on the logback-contrib, because MongoDB
Appender is not implemented in the logback-core but in the the
logback-contrib.