Adding more details to Slack notification on server hooks

Code diff: v2.0.11...v2.0.12

Adding a Slack server utility class to notify a Slack channel on server startup & shutdown

Code diff: v2.0.10...v2.0.11

Some utility methods

Code diff: v2.0.9...v2.0.10

1. Added constructServerURL method in RequestUtils
2. Few date utility method to parse ISO date & time
3. Exposing a few subject methods in MailUtils

Added a Request utility method to get the client IP address

Code diff: v2.0.8...v2.0.9

Patch release to add backward compatibility in the error response

Code diff: v2.0.7...v2.0.8

Changing the way error data is responded & adding two controller methods in BaseController

Code diff: v2.0.6...v2.0.7

Removed JodaTime library and added utility classes using Java 8 date time API

Code diff: v2.0.5...v2.0.6

1. Removed JodaTime library and added utility classes using Java 8 DateTime API
2. Added message based constructor to all exception classes
3. Added overloaded DomainUtils.save method to pass more data to domain's save method

ErrorCodeAwareException based exceptions and few utility methods

Code diff: v2.0.4...v2.0.5

Added common _object.gson and compile gson files

Code diff: v2.0.3...v2.0.4

Fixed responding error messages

Code diff: v2.0.2...v2.0.3