Merge pull request #8 from jyelee/master

change readme of develop section
[web-api] add 'type' parameter to create-file-share-link
Modify documents on extension
Finish extension and security
Finish documents on maintaining
fixed deploy_with_windows
add "python-dateutil"
Add cover images and improve docs on maintain
Add the source code location of this documents
Add document for location of logs
Add screenshot for system admin panel