Added alias for git clean

plugins/git/git.plugin.zsh

@@ -62,6 +62,7 @@ alias gm='git merge'
 compdef _git gm=git-merge
 alias grh='git reset HEAD'
 alias grhh='git reset HEAD --hard'
+alias gclean='git reset --hard && git clean -dfx'
 alias gwc='git whatchanged -p --abbrev-commit --pretty=medium'
 alias gf='git ls-files | grep'
 alias gpoat='git push origin --all && git push origin --tags'