update how to create seahub db for mysql on windows
Merge pull request #18 from haiwen/win-mysql

Updated how to create seahub db using mysql
documentation of the "scope" param

inside the accounts list call
Update web_api.md
documenting share_type in unshare a library
added 'users' param in share a library
added group delete call
added doc for group rename
rename directory api documented
Merge pull request #19 from bits4beats/master

updated web API documentation, see my comment
how to upgrade windows server if using MySQL
improve windows server document
updated howto download libreoffice
more about howto install libreoffice
change 'httpserver' to 'fileserver'