Fix output for aleph query --includeData

[yusefnapora]

I noticed on Friday that the recent Statement class refactor in #177 broke the output of the aleph query command if you use it with the --includeData flag. The "expanded" object body is included when you call inspect, but not when you try to print the Statement object as JSON.

So this PR changes the way we override the depth of the inspect call. Instead of doing it in the Statement.inspect method, we just return the JS object we want to print from Statement.inspect, and override the default inspect depth in the repl command. That way, in the aleph query command, we can call .inspect() on the query result and print it, including the embedded object.

This is much cleaner anyway, since how you format the output shouldn't be tied to the Statement class. I think when I wrote the earlier impl I hadn't discovered that you can override util.inspect.defaultOptions

[parkan]

Yeah, this is much better :)