fix name schema for sudo plugin

Plugin won't load automatically if added to variable $plugins, if name schema different than $name/$name.plugin.zsh is used (see is_plugin() in oh-my-zsh.sh).
Merge pull request #2368 from lumbric/master

fix name schema for sudo plugin
Add missing `command` wrapper for git

Signed-off-by: Mikhail S. Pobolovets <styx.mp@gmail.com>
Merge branch 'styx/git_command_prompt_fix' of github.com:styx/oh-my-zsh into styx/git_command_prompt_fix