dos2unix applied
Jira issue: APPSEM-3
Added button to start/stop sensor lisener
Jira issue: APPSEM-3
Fixed indentation and small fixes.
Jira issue: APPSEM-3
Added user and device info for sensors.
Jira issue: APPSEM-5
Merge pull request #2 from steverc/APPSEM-3-startstop

Add start/stop sensor listening and user/device info