Consequence type gbpa

Added Clinical loader to Cellbase-MongoDB
- New classes added:  CellBaseLoadMain, ClinicalMongoDBLoader, MongoDBLoader, ClinicalVariation, CellBaseMongoDBSerializer & ClinicalMongoDBLoaderTest
- Moved Gwas, Cosmic and Clinvar beans from cellbase-build to cellbase-core
- Added 'dummy' constructors with no parameters to Gwas, Cosmic and Clinvar beans because is needed for jackson to convert from json to objects
- CellbaseParser now implements AutoClosable to be used in 'try with resources' blocks
- Added resources needed for tests: cosmic.json.gz, gwas.json.gz & clinvar.json.gz
- Added dependencies in pom neeeded for tests: cglib and objenesis to mock objects (not needed to mock interfaces),  and gmaven plugin for running groovy tests
- Organized dependencies in different pom files (cellbase, cellbase-build & cellbase-mongodb)