Merge branch 'release-0.2' into develop
Bugfix: Added missing semicolon in examples/ scripts.
Implemented event on_connect_error.
Documented new callback on_connect_error.
Merge branch 'feature-error_on_connecting' into develop
Bugfix in heartbeat timer, prevented connection_lost event being fired twice.
Increased default connection timeout margin to 250ms.
Fixed bug in connect subroutine.
Cleared subscriptions state upon (re)connecting to broker to allow for re-subscriptions.
Increased version number to 0.21 and documented changes.
Merge branch 'release-0.21'