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* restrict the warning message

* and an important keyword in warning description

* a more elegant way of condition

* link format code too long

* fix the stupid spelling mistake

* Use issubclass to restrict warning message.

* maybe this version is more elegant.

* conv + bias + norm warning pytest

* 'created' a warning, hahaha

* isort and yapf format revision

* isort and yapf format revision

* flake8 fail issue

* I have to right this way in order to solve the conflicts between yapf and flake8, sigh...

* fixed test bug

* Add ruby windows installer source.

* Simplified the code and remove ruby source from CONTRIBUTING.md

* use _BatchNorm to simplify the code

* bug fix and add instanceNorm case into warning

* change the warning message to make it more clear

* fix unit test