Revert "first post"

This reverts commit 122b3995dfaf08d2bdb44819f4f453dd6c6288da.
Revert "Revert "first post""

This reverts commit 90c6efe7480e1b20165b4673b2fa5f03c412c7bb.
first post
Merge branch 'gh-pages' of https://github.com/dengzhirong/jekyll_demo into gh-pages