0.1.0-alpha107

* Various improvements:
    * Removed deprecated code from the Sales and SalesRule modules
    * Stabilized functional tests for the following modules:
        * Centinel
        * Core
        * RecurringPayment
        * Sales
        * Multishipping
        * Newsletter
        * Widget
* Fixed bugs:
    * Fixed an issued where a product could not be found in customer wishlist when searched by name
    * Fixed the invalid email template for Product Price Alert
    * Fixed an issue where customer group did not change when invalid VAT number was specified
    * Fixed integration tests coverage
    * Fixed an issue where a customer was not redirected to the configurable product page after clicking Add to Card on the My Wish list page for a product which required configuration
    * Fixed an issue where an error message was displayed when a customer tried to use checkout using PayPal Express Checkout
    * Fixed an issue where it was impossible to place an order using Authorize Direct Post
    * Fixed an issue where the page cache in Varnish mode didnt perform caching as required the cache
    * Fixed an issue where it was impossible to specify layout container when creating or editing a widget
    * Fixed an issue where a widget set to be displayed on certain type of product page was not displayed
    * Fixed an issue where it was impossible to create a widget to be displayed in a sidebar
    * Fixed an issue where a fatal error was thrown when trying to open a not existing page after disabling the 404 Not Found CMS page
    * Fixed an issue where it was impossible to refresh CAPTCHA in the Admin panel
    * Fixed an issue where two CAPTCHAs were displayed during guest Checkout
    * Fixed an issued where clicking the Preview button on revision preview page did not open the Preview page
    * Fixed an issue where the Magento\Framework\View\Element\AbstractBlockTest::testFormatTime failed randomly
    * Fixed logic duplication and the conflicting implementation of the title API in admin
    * Fixed an issue where JavaScript validation did not recognize the fields filled by automatic tests in the Create Customer form in the Admin panel
    * Fixed an issue where a fatal error was thrown after mass update of the Stock Availability product attribute
    * Fixed an issue where the Magento\SalesRule\Model\Resource\Report\CollectionTest::testPeriod CollectionTest::testPeriod integration test failed randomly
    * Fixed issues with expandable frontend elements
    * Fixed Blank & Luma themes UI bugs
    * Fixed an issue where the Packages pop-up displayed incorrect information
    * Fixed an issue where admin path became hidden when store address was too long
    * Fixed the styling of variations without base image
    * Fixed an issue where the Back link on a customer edit page led to the home page
    * Fixed an issue where it was impossible to save system config from Advanced->System
    * Fixed an issue where it was impossible to save a Return in the Admin panel
    * Fixed a JavaScript issue where it was impossible to expand nested categories if responsive
    * Fixed an issue where it was impossible to place an order using Authorize.net Direct Post in the Admin panel
* Framework improvements:
    * Declaration of components in composer.json
    * Added compiler for single-tenant mode
    * Both ZF1 and ZF2 libraries are declared as Composer dependencies as "1.12.9" and "2.3.1" respectively
    * ZF1 library is represented by 'magento/zendframework1', which is based on original "1.12.9" version and includes fixes for compatibility with Magento 2 application
* Layout improvements:
    * Refactored layout building
* Performance improvements:
    * Load product/category instances via repositories
    * Mobile and Desktop CSS styles stored in separate files
* Service Contracts:
    * Refactored the following modules to use new Customer service interfaces:
        * Checkout
        * Sales
        * Multishipping
        * GoogleShopping
        * Persistent
        * SalesRule
        * Paypal
        * Invitation
        * Tax
        * Newsletter
    * Code review changes for Service Contracts for the CatalogInventory module
    * Stabilized code after refactoring the Sales module to use new Customer service
    * Stabilized code after refactoring the Checkout module to use new Customer service
    * Deleted old CustomerAccount service tests
    * Fixed base service object class to populate custom attributes correctly
    * Fixed processing of array parameters in service interface for consolidated builder
    * Fixed trace information for service exceptions in dev mode
    * Implemented Bundle product API
* Accessibility improvements:
    * Heading2-Heading6 hierarchy of content structure
* UI improvements:
    * Style independent Error page in pub/errors styles
    * Updated the content of certain default CMS Pages
* GitHub requests:
    * [#691](https://github.com/magento/magento2/issues/691) -- Readonly inputs and after element html in the backend
    * [#694](https://github.com/magento/magento2/issues/694) -- missing git tags in repo