feat(Form): model is passed as parameter to default and before actions

Closes #126

BREAKING CHANGE: the signature of the default action that is called when submitting the form has changed.
    The form's model is always the first parameter, with an optional validation result as the second parameter

    Before:

    submit(validationResult) { ... }

    After:

    submit(model, validationResult) { ... }

addon/components/bs-form.js

@@ -233,15 +233,16 @@ export default Ember.Component.extend(ComponentParent, {
     if (e) {
       e.preventDefault();
     }
+    let model = this.get('model');
 
-    this.sendAction('before');
+    this.sendAction('before', model);
 
     if (!this.get('hasValidator')) {
-      return this.sendAction();
+      return this.sendAction('action', model);
     } else {
       let validationPromise = this.validate(this.get('model'));
       if (validationPromise && validationPromise instanceof Ember.RSVP.Promise) {
-        validationPromise.then((r) => this.sendAction('action', r), (err) => {
+        validationPromise.then((r) => this.sendAction('action', model, r), (err) => {
           this.get('childFormElements').setEach('showValidation', true);
           return this.sendAction('invalid', err);
         });

tests/integration/components/bs-form-test.js

@@ -23,25 +23,32 @@ test('form has correct CSS class', function(assert) {
 });
 
 test('Submitting the form calls default action', function(assert) {
-  this.on('testAction', () => {
+  let model = {};
+  this.set('model', model)
+  this.on('testAction', (m) => {
     assert.ok(true, 'Default action has been called.');
+    assert.equal(m, model, 'Action invocation has model as parameter');
   });
-  this.render(hbs`{{#bs-form action=(action "testAction")}}Test{{/bs-form}}`);
+  this.render(hbs`{{#bs-form model=model action=(action "testAction")}}Test{{/bs-form}}`);
 
-  assert.expect(1);
+  assert.expect(2);
   this.$('form').submit();
 });
 
 test('Submitting the form calls before submit action', function(assert) {
-  this.on('beforeAction', () => {
+  let model = {};
+  this.set('model', model)
+  this.on('beforeAction', (m) => {
     assert.ok(true, 'Before action has been called.');
+    assert.equal(m, model, 'Action invocation has model as parameter');
   });
-  this.on('submitAction', () => {
+  this.on('submitAction', (m) => {
     assert.ok(true, 'Default action has been called.');
+    assert.equal(m, model, 'Action invocation has model as parameter');
   });
-  this.render(hbs`{{#bs-form before=(action "beforeAction") action=(action "submitAction")}}Test{{/bs-form}}`);
+  this.render(hbs`{{#bs-form model=model before=(action "beforeAction") action=(action "submitAction")}}Test{{/bs-form}}`);
 
-  assert.expect(2);
+  assert.expect(4);
   this.$('form').submit();
 });