Merge pull request #591 from ably/release/1.2.43

Release/1.2.43

Fix compilation error after upgrading to cocoa 1.2.53

Merge pull request #582 from ably/release/1.2.41

Release/1.2.41

Merge pull request #574 from ably/release/1.2.40

Release/1.2.40

Merge pull request #570 from ably/release/1.2.39

Release/1.2.39

Merge pull request #569 from ably/release/1.2.38

Merge pull request #564 from ably/release/1.2.37

Release/1.2.37

Merge pull request #555 from ably/release/1.2.36

Release/1.2.36

Merge pull request #553 from ably/release/1.2.35

Release/1.2.35

Merge pull request #536 from ably/release/1.2.34

Release/1.2.34