JAMS Groups and Policies implementation

datastore/src/main/java/net/jami/datastore/dao/GroupDao.java

...store/src/main/java/net/jami/datastore/dao/PolicyDao.java

datastore/src/main/java/net/jami/datastore/dao/UserDao.java

...ain/java/net/jami/datastore/dao/UserGroupMappingsDao.java

.../src/main/java/net/jami/datastore/dao/UserProfileDao.java

...tore/src/main/java/net/jami/datastore/main/DataStore.java

datastore/src/main/resources/db/migration/V13__Users.sql

...tore/src/main/resources/db/migration/V14__Userprofile.sql

datastore/src/main/resources/db/migration/V15__Group.sql

datastore/src/main/resources/db/migration/V16__Policy.sql

...rc/main/resources/db/migration/V17__UserGroupMappings.sql

datastore/src/test/java/net/jami/datastore/dao/DAOTest.java

datastore/src/test/resources/db/migration/V13__Users.sql

...tore/src/test/resources/db/migration/V14__Userprofile.sql

datastore/src/test/resources/db/migration/V15__Group.sql

datastore/src/test/resources/db/migration/V16__Policy.sql

...rc/test/resources/db/migration/V17__UserGroupMappings.sql

...rc/main/java/net/jami/jams/common/objects/user/Group.java

...c/main/java/net/jami/jams/common/objects/user/Policy.java

...src/main/java/net/jami/jams/common/objects/user/User.java