Fix uninstallation : drop all classes and tables

git-svn-id: https://forge.indepnet.net/svn/genericobject/trunk@310 349b9182-4a13-0410-896f-e5e9767dd1b3
fixed #4945 The object Name must be singular

git-svn-id: https://forge.indepnet.net/svn/genericobject/trunk@311 349b9182-4a13-0410-896f-e5e9767dd1b3
Change author from Alexandre & Walid to Teclib'
Merge branch 'master' of https://github.com/TECLIB/glpi-plugin-genericobject