Merge pull request #2979 from maturano/2954_checkbox_value

[form] Get value of checkbox if its have

src/definitions/behaviors/form.js

@@ -455,7 +455,7 @@ $.fn.form = function(parameters) {
                   }
                   if(isCheckbox) {
                     if(isChecked) {
-                      values[name].push(true);
+                      values[name].push(value || true);
                     }
                     else {
                       values[name].push(false);
@@ -473,7 +473,7 @@ $.fn.form = function(parameters) {
                   }
                   else if(isCheckbox) {
                     if(isChecked) {
-                      values[name] = true;
+                      values[name] = value || true;
                     }
                     else {
                       values[name] = false;