Added my tiny review of technologies used
Added test for zero division
Added message to error response and test for it.
Changed request body representation to InputStream
Finished WADL part of assignment

Added .wadl for restcalc service (taken from GET to restcalc:8000/application.wadl).
Added WADL and wadl-client-plugin in pom.xml (NOTE: wadl-client-plugin 1.1.3 is buggy!).
Updated tests to use generated client.