Adds JSON output format

[leonelgalan]

Includes both rspec and cucumber tests as seen on the yaml report.

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I needed JSON output while setting up a CI with Reek. I was using the YamlReport and YAML.parse(output).to_ruby to get a Hash, but I thought this could be useful for others as well.

I'm getting some 1 failure on rspec and 1 on cucumber, but they are not related to the files changed on this PR. I'm getting the same failures when pulling from master. Maybe is something on my local setup, so I thought I'll give this a try.

[mvz]

Very useful. Looks good to me.

[troessner]

I know we are doing this a lot in our codebase but at least for new specs, lets not do the "include Reek" dance and use fully qualified constants.

[troessner]

Excellent addition!
Lets fix this one thing i commented on and re-squash - then i'll happily merge..;)

[chastell]

Does it have to be JsonReport rather than JSONReport?

(The only reason for these capitalisation abominations I heard about was related to Rails’ code autoloading, but I’m working on a Rails 2.3 app at the moment and even it would find JSONRerport in json_report.rb just fine.)

[leonelgalan]

Fixed and squashed! Thanks again for building Reek!

@chastell, I feel you but we the same applies to Yaml, Html, Cli, etc. It might require a major refactor to change all this and add consistency across the project.

[troessner]

Great job, merged, thanks!

[chastell]

@chastell, I feel you but we the same applies to Yaml, Html, Cli, etc. It might require a major refactor to change all this and add consistency across the project.

Challenge accepted.