Version 0.5.0

Update README-zh-cn.md (HelloZeroNet#618)

* Update README-zh-cn.md

* Update README-zh-cn.md

* Update README-zh-cn.md

* Update README-zh-cn.md

* Update README-zh-cn.md

Rev1510, Fix site save without loaded SiteManager

- Merger sites

- User file archiving support
- Allow custom field in json db table

Merge pull request HelloZeroNet#470 from Emeraude/fix-file-permissions

Fix file permissions

Merge pull request HelloZeroNet#470 from Emeraude/fix-file-permissions

Fix file permissions

Tag 0.3.6

Rev860, Re-enable ajax on non-html items

Rev668, Stop if UiServer bind failed to avoid double start