fix null value with momentary switch

properly handle momentary switch in AWS IoT; failsafe reconnect

Merge pull request konnected-io#115 from konnected-io/cloud-provisioning

fixes preflight response for iOS CORS check

Merge pull request konnected-io#112 from konnected-io/cloud-provisioning

completing features for cloud provisioning

add 2.3.1 filesystem image

Merge pull request konnected-io#101 from konnected-io/aws-iot

2.3.0: Cloud Connectivity, OTA Updates, foundational support for MQTT

cleanup old firmware files

update version numbers

bump fw version number and build date

fix json parsing error if actuator GET endpoint returns an error