Support referencing console by build number

Add an option to the console command which takes a build number value:

nestor console jobName --build 84

The command outputs the console for the specified build, rather than the latest one as the console command would do by default. I expect most people would use it to print out the console for completed builds.

[cliffano]

@thisgeek Thanks for the feature request. To keep things consistent with the other commands, the console command format would look like this: nestor console <job_name> [build_number] with job_name being mandatory and build_number optional.

[cliffano]

@thisgeek Thanks for checking it out.