added ping service to send ping message to server
removed ping service
new notification logic
added tabbed activity
added cutom theam senzors
displaying sensor details activity
replaced email with username in share activity
db helpers, first step
modified db helper with triggers
added more db source methods
added ids to sensor and user POJOs
setup preference utils with pojo ids'
added first time checking method to preference utils
modified login activity according to POJO id changes
modified applicatin object according to POJO id changes
modified db source according to POJO id change
displaying sample usernames in sharing tab
refactore db helper, source
removed unwanted constrctor from user
setup to work with db
added user object to sensot POJO
refactored db source
refactored sensor details activity