[admin] the message given by the !admins command when no admins are online can now be customised in the admin plugin config file
Merge pull request #41 from thomasleveil/release-1.10

[DOC] start user documentation for the admin plugin
Merge pull request #42 from thomasleveil/admins_no_admins

[admin] the message given by the !admins command when no admins are onli...