Put example js file in classroom player directory.

[greghuc]

What does this PR do?

This PR augments classroom-mode behaviour. When a new directory is created for a player, an example javascript file is now also created in this directory. The file is called "greet.js" and contains:

//Try running this function from Minecraft with: /js $username.hi( self )
//Remember to use your real username instead of $username!
//So if you had username 'walterh', you would run: /js walterh.hi( self )
exports.hi = function( player ){
    echo( player, 'Hi ' + player.name);
};

This filename and content match the example discussed in the classroom.js comments.

Why make this change?

We used Scriptcraft classroom-mode at CoderDojo Stirling with a bunch of enthusiastic but non-technical kids.

Setup was pretty challenging, as the kids had to wrap their heads round:

• opening the samba-share of the remote players dir
• copying a js file from their laptop into the remote player dir
• opening, editing and saving this remote js file
• running the js code from the minecraft client

Things went better the second time round, when we ensured there was a js file in-place in their remote player dir (i.e. this PR). So, setup became:

• opening the samba-share of the remote players dir
• opening, editing and saving the in-place js file in the remote player dir
• running the js code from the minecraft client

Have you tested the change?

The change has been tested by hand for these cases:

• Blew away remote player dir on minecraft server, logged in as new player, and ensured greet.js existed in remote player dir
• Deleted greet.js from remote player dir, logged in as existing player, and ensured greet.js wasn't recreated.

Many thanks for Scriptcraft - it's awesome!

Cheers

Greg
CoderDojo Stirling