> Externalize configuration

> Set up template engine
Removed configuration.json from resources
Setup mail notification with a gmail smtp server
Put a Http Controller for creating rawnotifications with a json http put request
Add singleMailByRecipient Notificator
Add a listener for creating subscriptions with a http json post
Add sample client for create subscription with http post
Create a singleMultiTopicMailByRecipientNotificator
Add configuration and template sample files
Add cleaner configuration management, with default values, dynamic options, check of unicity of channels.
Set period of selector and notificator tasks configurable in configuration.json
Set MongoDb connection configurable in localsettings.properties
Add support for custom notificator and custom selector

Show example of such component in configuration_3.json
Init custom directory for examples of notification engine customization, based on maven war overlay.
First example will be a selector based on jdbc.
Add license
Add a custom jdbc selector
Add todo in mailer
Start to improve documentation
Start to improve documentation
Update README.md
Improve documentation