validationの設定
Merge branch 'master' into validation

Conflicts:
	app/views/lt_requests/_form.html.erb
seedと関連の間違いを修正
seedと関連の間違いを修正
Merge branch 'validation' of github.com:slp-cem/lightningpress into validation
lightningtalkの日付範囲の制限を無くす
Merge branch 'validation' of https://github.com/slp-cem/lightningpress into validation

Conflicts:
	app/models/lightningtalk.rb
	app/models/request_comment.rb
	app/models/request_notification.rb
Merge pull request #48 from slp-cem/validation

Validationの設定と細かな修正