Remove LinkedJson wrapping from queryGraph output
Close #4

* Removing LinkedJson - forwarding server output to the user for
  further processing
* Added/Cleaned test cases for `queryGraph`
Merge pull request #36 from andhikanugraha/feature/query-POST

Use HTTP POST for `query` and `queryGraph` - Thanks @andhikanugraha
FormData not passing through the Browser

The parameters in `query` and `queryGraph` passed in the POST method
are not working with the browser, this seems to be an issue with the
way FormData is being sent. Using serialized version of parameters
in a string.
Applying map transformation correctly to POST query params