add maven plugin for auto deployment of sosiefier

[danglotb]

Hello,

I propose the following changes to be able to deploy sosiefier on a github repositories.

in order to deploy it, add the following lines in your setting.xml of your installed maven:

<server>
    <id>github</id>
    <username>USERNAME</username>
    <password>PASSWORD<password>
</server>

Ensure that the setting.xml file is not readable for the world. (chmod 700 setting.xml)

and then run

mvn clean deploy