Stop using deprecated methods

Replace deprecated methods
  `onSuccess(String response)`
  `onSuccess(byte[] binaryData)`
with
 `onSuccess(int status, Header[] headers, byte[] body)`
Improve RestAdapter logging

Introduce static `TAG` field to use in all logs.

Use Log.w and Log.d where appropriate.

Fix logging of request body, print the real content instead of
  `org.apache.http.entity.StringEntity@{pointer}`
Merge pull request #24 from strongloop/feature/improve-api

Replace usage of deprecated methods, clean logging