- modified json response object in user, group and transactions controller
- added migration to add password field to users table
added new services to -
 + group_expenses_report'
 + sync_contacts'
 + add_group_members'
 + authenticate_user'
 + get_groups'
 + get_group_members'
 + get_group_transactions'
 + get_all_group_members'

updated routes
- added migration to add gcm device_registration_id field to users table
- implemented push notification after adding transaction
- added gcm configuration file
schema changes
- modified gemfile
db config
Merge branch 'master' of https://github.com/forkout/forkout_api into dev_branch