Adding support for peeking into Json array files

[jknaudt21]

Currently the code does not allow us to peek in to Json array files. For example, if we try to read from a file that looks like this:

[
  {"hello" : "world"}
]

We get error Error reading JObject from JsonReader. Current JsonReader item is not an object

A simple fix is to change JObject.Parse(...) to JToken.Parse(...) in the peeking process.

[kzu]

Closed by #71