* Reference implementation for memory
* memory reference implementation tests, fixes
* new class Variable context
* fix ngraph code style
* add new evaluate method to ngraph::function
* unordered_set instead of set in find_variables method
* added a new Memory base class; automatiс memory allocation for Variable context in Assign ops; refactoring
* ngraph codestyle
* ngraph codestyle
* temporary disable the check of variables in ngraph::function
* fix for evaluate hides overloaded virtual function warning
* ngraph codestyle
* uncomment a check in validate_and_infer method
* Removing a check (not backward compatible); adding docs
* Auto detect Parameters/Variables, new constructors in ngraph::function
* use zero initial values in ReadValue v6 evaluate
* fix unit tests
* fix codestyle
* fix build (werror)
* ngraph codestyle
* update unit tests, refactoring
* ngraph codestyle
* refactoring, docs, new unit tests
* Resolve review remarks
* rt_attributes likeapproach in EvaluationContext, codestyle
* fix build and unit tests
* resolve review comments
* resolve review comments
* codestyle
* export public API
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