update rails gem

ver. 4.1.4 -> 4.1.5
Merge pull request #15 from gouf/update_rails

update rails gem
add login spec
rubocop: add exclude rule, bin directory
Merge pull request #16 from gouf/rubocop

rubocop: add exclude rule, bin directory
update:admin-ui design
spec: sys controller
Merge branch 'master' of github.com:shirasagi/shirasagi
faq-search
Merge branch 'master' of https://github.com/shirasagi/shirasagi