Project is mavenized!

[SimSonic]

Hello! This little change is making a lot of easier developers to keep Updater code in their plugins up-to-date!

I've setted up my own Jenkins to automatically build it from here (my from my fork but after you accept my Pull Request - yours code).

Any developer can add it into his project by adding this lines into pom.xml:

<repositories>
    ...
    <repository>
        <id>voxile.ru</id>
        <url>http://ci.voxile.ru/plugin/repository/everything/</url>
    </repository>
    ...
</repositories>
...
<dependencies>
    ...
    <dependency>
        <groupId>net.gravitydevelopment</groupId>
        <artifactId>Updater</artifactId>
        <version>2.0</version>
    </dependency>
    ...
</dependencies>

And setup shading it into .jar.

[gravitylow]

Pulled with some changes, thanks!