Moved web service client code to separate class.
Added interface with hard-coded defaults, refactored JerseyClient to use
it when needed.
Refactoring: extracted interface for future implementations of web
service clients.
Minor refactoring
POM: pulled versions of dependencies out to the properties element.
Preparations to substitute raw String web-response with more structured
data (i.e. POJOs graph).
Changed raw String web-service response with structured data. Provided
toString() impl for model classes.