Delete environment.rb

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Revert "Delete environment.rb"

This reverts commit af6bdef477c44b95cfb28df04bc52b80bdeacefb.
Revert "Revert "Delete environment.rb""

This reverts commit a76fe2d2725a83a812cbca8a42f05d756ba5e7a9.
Revert "add comment"

This reverts commit 0d8dd65945cbfde9610ca5c362d0860a78491192.
Merge pull request #1 from JinnTao/master

Hello World