Create tests for Category REST Controller and Offer REST Controller.
Closes issue #25

Finished CategoryServiceTests
Change pom.xml
   - added jsonpath dependency (it can be used to parse json, see if json field exist, check value into a field.
Merge branch 'dev-issue-#25'

Conflicts:
	src/main/java/com/bargainhunter/bargainhunterws/services/CategoryService.java
Closes issue #25

Finished CategoryServiceTests
Change pom.xml
   - added jsonpath dependency (it can be used to parse json, see if json field exist, check value into a field.