Stringify query params JSON value
Test: green ok's
Trim whitespace
Test: add custom variable with node version
Readme: fixed new npm link
Readme: minor clean up
Package: version 0.3.0

* Minimal node version is 0.8.0
* Added .track method
* Added method chaining
* Removed .http method
* Added test script
* Properly handle response data
* Readme: added author footnote
* Clean up, misc readme edits