Silence warnings from glog library.

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Each time we include #include <glog/logging.h>, we get the following warning message:

glog\install_dir\include\glog/logging.h(1167): warning C4355: 'this' : used in base member initializer list

Each glog include statements should be wrapped with a proper #pragma directive to silence the warning. ie:

 #pragma warning( push )
 #pragma warning( disable: ThatWarning )
 //code with ThatWarning here
 #pragma warning( pop )