FreeBSD's mc without subshell alias and silenced gitinfo.

Added alias for FreeBSD for mc launch as normal user, which may
lack PTY access. Related to #6.

Silenced gitinfo's errors on just-inited repo. Fixes #3.

zsh/aliases/20-freebsd.conf

@@ -3,4 +3,7 @@
 if [ "${OS/FreeBSD}" != "${OS}" ]; then
     # Files navigation.
     alias ls="ls -G"
+    # mc having troubles with subshells and normal users accounts.
+    # Force an alias that will launch mc without subshell capabilities.
+    alias mc="mc -u"
 fi