Correct a spelling mistake.

Change-Id: I7ace93cc743b69b1424857c62f272946c0ebcc56
Test that JobContent can be used in stl containers and algorithms.

Change-Id: I3563993520a318d29007889bb898aa203774ac94
JobContent now lazily computes md5hash, and uses less memory on deserialize.

Change-Id: Icb7e3308f6c997c9796ce329775a458fa96886b8