Issue #86 - Adding request body to the JsonParseException on demand

[LokeshN]

This commit adds the request body(issue #86 ) to the JsonParseException on demand.
By setting the property addRequestBodyOnError in JsonParser, the request body is added to JsonParseException.
The request body is added as a separate property to the JsonParseException which can be retrieved using JsonParseException.getRequestBody()

By default the request body will not be added to the JsonParseException as the flag is turned off, it can be turned on by using JsonParser.addRequestBodyOnError(true);

[cowtowncoder]

While I appreciate your suggestion for solution, I don't think I will accept it. Most InputStreams and Readers are not rewindable and so most of the contents would not be available to be included in exception. There are other potential issues (max length of contents to read should probably be bounded), but that is the main one.

[LokeshN]

I have created another pull request with a different solution.
Closing this for now.