Update changelog and bump versions for 1.6.2

Change-Id: If521bce9c9b555356ea44375405f55843cff2eca

Update changelog and bump versions for 1.6.1

Change-Id: Iaed12d39f96e3b71f59a3399bf71f47fee317275

Update changelog and bump versions for 1.6.0

Change-Id: I8fdb562b35bdb2ae77a8250990bfeb0058c8faa7

Bump version numbers for 1.5.2

Bump version numbers for v1.5.1