3.4.0

• implemented NgxSelectComponent.autoClearSearch for: #30 (comment)

• Implemented INgxSelectOptions for override default options: #18 (comment)

  Example to use:

  import {NgModule} from '@angular/core';
  import {BrowserModule} from '@angular/platform-browser';
  import {AppComponent} from './app.component';
  import { NgxSelectModule, INgxSelectOptions } from 'ngx-select-ex';
  
  const CustomSelectOptions: INgxSelectOptions = {
      optionValueField: 'id',
      optionTextField: 'name'
  };
  
  @NgModule({
    imports: [BrowserModule, NgxSelectModule.forRoot(CustomSelectOptions)],
    declarations: [AppComponent],
    bootstrap: [AppComponent],
  })
  export class AppModule {
  }

• implemented option NgxSelectComponent.size: #27 (comment)

• removed type=button attribute from span.ngx-select__selected-plural: #24 (comment)

• implemented default option NgxSelectComponent.keyCodeToRemoveSelected: #23 (comment)

• fix: When the dropdown item is too long, the textbox breaks - #29

• add: css class ngx-select__toggle-buttons.

• WARNING! Removed old classes. See to table of "deleted >>> alternative":

  deleted	alternative
  ui-select-container	ngx-select
  ui-select-multiple	ngx-select_multiple
  ui-disabled	ngx-select__disabled
  ui-select-match	ngx-select__selected
  ui-select-toggle	ngx-select__toggle
  ui-select-placeholder	ngx-select__placeholder
  ui-select-match-text	ngx-select__selected-single
  ui-select-allow-clear	ngx-select__allow-clear
  ui-select-match-item	ngx-select__selected-plural
  ui-select-search	ngx-select__search
  ui-select-choices	ngx-select__choices
  ui-select-choices-row	ngx-select__item