Replace log4js by pino as logger:

- Logs to stdout, disabled while testing
- Change log calls signature when needed
- Use development version of camshaft
- Removes unused log cofiguration
- Bind request id to log req/res
- Log req at the begining of the cycle and res at the end

lib/server-options.js

@@ -52,9 +52,6 @@ var analysisConfig = _.defaults(global.environment.analysis || {}, {
         endpoint: 'http://127.0.0.1:8080/api/v2/sql/job',
         hostHeaderTemplate: '{{=it.username}}.localhost.lan'
     },
-    logger: {
-        filename: undefined
-    },
     limits: {}
 });
 
@@ -118,9 +115,6 @@ module.exports = {
             endpoint: analysisConfig.batch.endpoint,
             hostHeaderTemplate: analysisConfig.batch.hostHeaderTemplate
         },
-        logger: {
-            filename: analysisConfig.logger.filename
-        },
         limits: analysisConfig.limits
     },
     // Do not send unwatch on release. See http://github.com/CartoDB/Windshaft-cartodb/issues/161