Add openjdk to the dependencies.

[Rafiot]

Just to avoid that:

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.0.2:compile (default-compile) on project RoboMinionsPlugin: Compilation failure
[ERROR] Unable to locate the Javac Compiler in:
[ERROR] /usr/lib/jvm/java-7-openjdk-amd64/jre/../lib/tools.jar
[ERROR] Please ensure you are using JDK 1.4 or above and
[ERROR] not a JRE (the com.sun.tools.javac.Main class is required).
[ERROR] In most cases you can change the location of your Java
[ERROR] installation by setting the JAVA_HOME environment variable.
[ERROR] -> [Help 1]
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException```

[katharosada]

Thanks! :)

[Rafiot]

Yep, it does work :)

Impressive work by the way, I will use it a lot to teach python to kids!