Updated check_mysql.c to take client options file and group parameters
Merge branch 'master' of https://github.com/jonmilby/nagios-plugins

* 'master' of https://github.com/jonmilby/nagios-plugins:
  Updated check_mysql.c to take client options file and group parameters

Conflicts:
	plugins/check_mysql.c
check_mysql: Fix copy'n'pasted comments
check_mysql: Use xasprintf instead of asprintf
check_mysql: Don't accept new positional arguments

Do not also accept the new -f/--file and -g/--group options as
positional arguments (especially not prior to "db_pass" and "db", as
that would break backward compatibility).
NEWS: Mention the new "check_mysql -f/-g" options

Closes #32.