Move folders to standard Maven layout:

src
  main
    java
  test
    java
Change POM to reflect Maven Central (Sonatype) requirements

Also use now mavenised projects minlog and jsonbeans as normal Maven
dependencies. TODO: switch to release version as soon as it is available
on Maven Central. Subsequently this project can also be released on MC
in a secondary step.
Move everything under kryonet/ up one directory level