Remove terrain generator in favor of voxel-flatland

TODO: move the original generator (has a demonstration of glass, and
some other more complex generation, but like voxel-land) to another
plugin, #6

index.js

@@ -4,14 +4,11 @@ var main = function() {
   createEngine({pluginLoaders: {
     './lib/blocks.js': require('./lib/blocks.js'),
     'voxel-flatland': require('voxel-flatland'),
-    //'./terrain.js: require('./lib/terrain.js'),
   }, exposeGlobal: true, pluginOpts: {
     'game-shell-fps-camera': {position: [-4, -40, -5], rotationX:15*Math.PI/180, rotationY:135*Math.PI/180 },
 
     './lib/blocks.js': {},
     'voxel-flatland': {block: 'bedrock'},
-
-    //'./lib/terrain.js': {}
   }})
 };