MAGETWO-3387: 'Append Comments' is cleared on validation error during Order Submit
MAGETWO-3387: 'Append Comments' is cleared on validation error during Order Submit
MAGETWO-13915: PSR-3: common interface for logging libraries.
MAGETWO-13915: PSR-3: common interface for logging libraries.

 - rename logException to critical
MAGETWO-31784: Tax class drop-down on New Customer Group page should not contain value 'none'
Merge remote-tracking branch 'origin' into MAGETWO-31784
MAGETWO-13915: PSR-3: common interface for logging libraries.

 - renamed log to info
 - renamed logFile to debug
 - renamed logDebug to debug
MAGETWO-13915: PSR-3: common interface for logging libraries.

 - fixed unit tests
MTA-588: Re-factor Test for Advanced Search
MAGETWO-31898: Add composer.lock to CE Repository
MAGETWO-31961: Exception when add configurable product from wishlist into cart(problem with product id and item_id)
MAGETWO-31784: Tax class drop-down on New Customer Group page should not contain value 'none'
MTA-589: Re-factor Test for Quick Search
MAGETWO-31784: Tax class drop-down on New Customer Group page should not contain value 'none'
MAGETWO-13915: PSR-3: common interface for logging libraries.

 - replace Magento\Framework\Logger to Psr\Log\LoggerInterface
MAGETWO-13915: PSR-3: common interface for logging libraries.

 - configure logger
MAGETWO-13915: PSR-3: common interface for logging libraries.

 - eliminate Magento\Framework\Logger
MAGETWO-27636: Persistent Shopping Cart: 'Not %Username%?' link is displayed during page load for user logged in
MAGETWO-31961: Exception when add configurable product from wishlist into cart(problem with product id and item_id)
MAGETWO-30854: Unexpected <br> html element is present on 'View Return' Customer account frontend page