Merge pull request #8 from yuji-shimoda/issues/#1

view update.
user edit view update.
user edit & show implementation.
<pre> tag bug fix.
Merge pull request #9 from yuji-shimoda/issues/#2

Issues/#2
Fixed unauthorized access to pages only for logged in users.
Logout function implementation.
Merge pull request #10 from yuji-shimoda/issues/#3

Logout function implementation.
Merge branch 'master' into issues/#6

Conflicts:
	app/controllers/users_controller.rb
Merge pull request #11 from yuji-shimoda/issues/#6

#6: Fixed unauthorized access to pages only for logged in users.
add twitter link.
Merge pull request #14 from yuji-shimoda/issues/#4

add twitter link.
Routing error bug fix.
Home link bug fix.
view update.
user views update.
Merge pull request #17 from yuji-shimoda/issues/#16

user views update.
#15 add github url link.
Merge pull request #18 from yuji-shimoda/issues/#15

#15 add github url link.
users#edit routing /settings.