v0.15.1

DistributedFactorGraphs v0.15.1

Diff since v0.15.0

Closed issues:

• Why DefaultOrthonormalBasis()? (#791)

Merged pull requests:

• test getPointIdentity (#789) (@dehann)
• slight improvement to serialization code (#790) (@dehann)
• Change to DefaultOrthogonalBasis and add as arg (#792) (@Affie)
• fix required for IIF tests with new gradients (#793) (@dehann)
• v0.15.1-rc1 (#794) (@dehann)