refactor(core): move directives, pipes, and forms into common

BREAKING CHANGE

All private exports from 'angular2/src/core/{directives,pipes,forms}' should be replaced with 'angular2/src/common/{directives,pipes,formis}'

Closes #5153

modules/angular2/src/common/forms.ts

@@ -0,0 +1,42 @@
+/**
+ * @module
+ * @description
+ * This module is used for handling user input, by defining and building a {@link ControlGroup} that
+ * consists of
+ * {@link Control} objects, and mapping them onto the DOM. {@link Control} objects can then be used
+ * to read information
+ * from the form DOM elements.
+ *
+ * This module is not included in the `angular2` module; you must import the forms module
+ * explicitly.
+ *
+ */
+export {AbstractControl, Control, ControlGroup, ControlArray} from './forms/model';
+
+export {AbstractControlDirective} from './forms/directives/abstract_control_directive';
+export {Form} from './forms/directives/form_interface';
+export {ControlContainer} from './forms/directives/control_container';
+export {NgControlName} from './forms/directives/ng_control_name';
+export {NgFormControl} from './forms/directives/ng_form_control';
+export {NgModel} from './forms/directives/ng_model';
+export {NgControl} from './forms/directives/ng_control';
+export {NgControlGroup} from './forms/directives/ng_control_group';
+export {NgFormModel} from './forms/directives/ng_form_model';
+export {NgForm} from './forms/directives/ng_form';
+export {ControlValueAccessor, NG_VALUE_ACCESSOR} from './forms/directives/control_value_accessor';
+export {DefaultValueAccessor} from './forms/directives/default_value_accessor';
+export {NgControlStatus} from './forms/directives/ng_control_status';
+export {CheckboxControlValueAccessor} from './forms/directives/checkbox_value_accessor';
+export {
+  NgSelectOption,
+  SelectControlValueAccessor
+} from './forms/directives/select_control_value_accessor';
+export {FORM_DIRECTIVES} from './forms/directives';
+export {NG_VALIDATORS, NG_ASYNC_VALIDATORS, Validators} from './forms/validators';
+export {
+  RequiredValidator,
+  MinLengthValidator,
+  MaxLengthValidator,
+  Validator
+} from './forms/directives/validators';
+export {FormBuilder, FORM_PROVIDERS, FORM_BINDINGS} from './forms/form_builder';