docs(readme): add link to maven snapshot repository
feat(processes): auto-reload and redeploy '.bpmn' process definitions placed beneath 'grails-app/processes'

The feature is by default turned on for 'dev' and 'test', turned off for all other envs.
In addition, one can turn this feature on/off explicitely by editing Config.groovy:

camunda {
  deployment.autoreload = true // (or false)
}

Closes #21