Change project structure to standard maven structure and add maven pom.xml

The pom.xml file makes this project a maven project.
Compilation of the native sources with maven is NOT included, yet.
The folder structure of the project is changed to represent the default maven structure.
This will simplify the configuration and general usage of maven.
Merge pull request #1 from kelthuzad/mavenstructureBeta500

Change project structure to standard maven structure and add maven pom.x...