Write characterization test for ApplicationController#login
Split before_filter :login

ref: #80
Merge remote-tracking branch 'ykzts/split-login-filter' into member_helper
Write test for ApplicationController#login_required and ApplicationController#current_member
use settingslogic for configurations

refs. https://www.ruby-toolbox.com/categories/Configuration_Management
Merge pull request #102 from fastladder/member_helper

Split before_filter :login w/ tests #80, #101
Merge pull request #107 from onk/use_settingslogic

use settingslogic for configurations
database.yml.mysql: mysql => mysql2
Merge pull request #110 from makimoto/mysql_to_mysql2

database.yml.mysql: mysql => mysql2