Move to maven 3

• Maven 3 requirements
• Jdk 7 requirements

Split Api module in two modules

• The Api module helper-maven-plugin-api
• The Test Api module helper-maven-plugin-test-api

Split project in two modules

To make easier usage of the toolbox, prefer to split the project in two modules;

• One for pure mojo api (used by any of our mojo plugins) (helper-maven-plugin-api)
• One for mojo implemented by the project (helper-maven-plugin)

Introduces a new api for mojo dealing with encoding.

The new contract is org.nuiton.plugin.PluginWithEncoding.

To use it, just add an implements for your mojo on this contract and implements it.

When mojo will be init, it will check sanity of encoding and if no encoding was specified, it will use the system one defined by system property file.encoding.

Improve check-auto-container mojo

Add a runOnce property flag to execute once per artifact (increase release process).