Build REST resource for LabTestSpecimen

In the jsslab module, there is a .java and .hbm.xml file the lab_test_specimen table/LabTestSpecimen object. This needs to have a REST resource created. For instructions on creating a REST resource, see wiki.openmrs.org/display/docs/REST+Web+Services+API, and the related pages REST Web Service Technical Documentation and Adding a Web Service Step by Step Guide for Module Developers. For an example, in the omod code rest directory, see LabInstrumentResource.java and LabSupplyItemResource.java. It may be necessary to add some convenience methods to the LabTestSpecimen POJO, especially to get names instead of concepts. It will be necessary to create LabTestSpecimenDAO interface and a HibernateLabTestSpecimenDAO implementation that contains all the POJO methods (the implementation just delegates them to the POJO). Other reusable methods can be added at the DAO level. It will also be necessary to create or modify LabTestingService and LabTestingServiceImpl to expose all the methods of the DAO (implemented through delegation). Any methods used by the REST resource should be in the LabTestingService.