Add a watch task to recompile assets on change

Gruntfile.js

@@ -27,12 +27,20 @@ module.exports = function (grunt) {
 					'public/css/main.css': 'public/less/main.less'
 				}
 			}
+		},
+
+		watch: {
+			less: {
+				files: ['public/less/**/*.less'],
+				tasks: ['less']
+			}
 		}
 
 	});
 
 	grunt.loadNpmTasks('grunt-contrib-jshint');
 	grunt.loadNpmTasks('grunt-contrib-less');
+	grunt.loadNpmTasks('grunt-contrib-watch');
 
 	grunt.registerTask('lint', ['jshint']);
 	grunt.registerTask('compile', ['less']);