Revert "Revert "s/manager/admin/""

This reverts commit 54c90aa67ebcbcb9c85fe869a4290096b2f74900.

Conflicts:
	adduser/secret/ldap.manager.secret.gpg
	deluser/secret/ldap.manager.secret.gpg
merges adduser/ and deluser/
separates Model definitions
writes TODO comments
moves adduser.rb(644) to adduser(755)
defines the module ManageUser
organizes ``require''s
adds test program for adduser
adds secret/ldap.manager.secret.gpg
adds gemfile
adds gem 'activeldap'
defines some options in optparser
unifies indentation: s/\t/  /
initializes parameters with validation
defines password utility functions
sets randomly generated password
organizes private method
moves error,warning,info methods to module
implements create_user method
puts model classes under the module

Module の下にモデルクラスを置くとなぜか
うまくいかないと思っていたが，最新の
active_ldap を使っていると大丈夫な
ようなので，切り分けた．