- Updates dependecy version

- Fix Co

ncurrent Modification Exception

- Fixes periodic jobs flex (in millis) issue

- Updates buildToolsVersion to 25.0.3 and support libs dependency to …

…25.3.1

- Removes additional logging

- Updates support and play-services libs dependencies

- Adds flexInMillis for PeriodicTask jobs

- Adds equals() method in Job

- Adds initialDelayInMillis for Periodic Jobs

- Fixes minSDKVersion to 14

- Adds method to get scheduled job for given jobID

- Adds utility method to readme