AbstractDomainFieldHandlerImpl.java:
  add object operation handlers for byte key

DomainFieldHandlerImpl.java:
  support tinyint mapped to byte for primary key columns

DomainTypeHandlerImpl.java:
  allow byte.class and Byte.class to be used for key column values

PartitionKey.java:
  support byte primary key

clusterj-test/Makefile.am:
  test case for byte primary key

DynamicBytePKTest.java:
  test that instances with byte pk can be inserted, deleted, and queried

PartitionKeyImpl.java:
  implement primary key byte columns