Support fetching adjustments in a specific state
Increase visibility of doGET to allow hand crafted requests to invoke
calls using the client's baseUrl
Fix parameter delimiter
Fixed token encoding issue with StringBuilder
Add an integration test for getAccountAdjustments
Tweaks for https://github.com/killbilling/recurly-java-library/pull/38 before merge:

* Reduce visibility of doGET
* Remove StringBuilder
* Fix whitespace issues

Signed-off-by: Pierre-Alexandre Meyer <pierre@mouraf.org>
Merge branch 'ets-SupportAdjustmentState'