When --no-* is used default to true

lib/commander.js

@@ -111,6 +111,9 @@ Command.prototype.option = function(flags, description, fn){
     , option = new Option(flags, description)
     , name = option.name();
 
+  // when --no-* we default to true
+  if (false == option.bool) self[name] = true;
+
   // register the option
   this.options.push(option);
 

test/test.options.bool.js

@@ -0,0 +1,16 @@
+
+/**
+ * Module dependencies.
+ */
+
+var program = require('../')
+  , should = require('should');
+
+program
+  .version('0.0.1')
+  .option('-p, --pepper', 'add pepper')
+  .option('-c, --no-cheese', 'remove cheese');
+
+program.parse(['node', 'test', '--pepper']);
+program.pepper.should.be.true;
+program.cheese.should.be.true;