Fix SPARK_ACCESS_KEY to SPARK_ACCESS_TOKEN in the comment
Fixed #133 and moved US_TICK macro to core-common-lib
Updated implementation for delay() and issue #133 in core-common-lib
Use new SparkProtocol::send_event() interface for Spark.publish()
Merge pull request #132 from TechplexEngineer/patch-1

Fix SPARK_ACCESS_KEY comment
Implemented #104 - Run SPARK_WLAN_Loop() during long delays
Give high priority to OTA update during long delays
Merge branch 'master' into compile-staging
Merge branch 'compile-staging' of github.com:spark/core-firmware into compile-staging