day 4 is over, some changes that occured:
-add autoload helper: form
-modifiy the controller(email.php)
-add new view(newsletter)
-add css style property
day 5 is over, some changes that occured:
-add autoload helper: url, form
-make site as default controller
-modifying controller(site)
-create model(site_model)
-create view(options_view)
Merge branch 'day5' into master

Conflicts:
	application/config/routes.php
	application/controllers/site.php
	application/models/site_model.php