Exception mail, validation mail and developers mail utility

New Features

1. Utility method to send exception email with detailed stacktrace
2. Utility method to send email when a domain validation fails
3. Simple method to send email to developers
4. Request utility method to get request headers as map

Code diff: v1.0.4...v1.0.5

Added NumberToWord utility class

v1.0.2

Released version v1.0.2

Excluding UrlMappings.groovy classes on the final build

v1.0.1

Released version v1.0.1

Migrated to Grails 3 & some utility classes

v1.0.0

Released version 1.0.0