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+ Add multi-format post support
+ Add ``config.config.static_source``
+ Add ``config.config.static_output``
+ Support Non-meta post.
+ Support customize permalink for post
+ Support TXT format post.
+ Support HTML format post.
+ Support YAML format meta.
+ Rewrite `catsup install`
+ Correct the url for Twitter Card Support
+ Drop file-based cache system.
+ Improve description creator
+ Reorganize code.