added 'devicy_sync' and 'sync_status' api endpoints
fix bug in fitbit sync
Merge commit 'e595cdc94ecb33535baa60521eddfae4ac891a44' into pullrequests/more-api-endpoints

Conflicts:
	tac/apiserver.py
log fitbit api request
Merge pull request #16 from wangsha/pullrequests/more-api-endpoints

added 'devicy_sync' and 'sync_status' to api endpoints