kakao auth spec from #154
test: kakao auth process leads me to email verification page at first log in
test: kakao auth process sends activation ticket to me
test: show me error message when I submitted an invalid email
test: kakao auth process lets me activate my account to click activation link
test: kakao auth process shows me error message when I clicked an invalid activation link
test: kakao auth process sends activation ticket whenever I requested a ticket
test: kakao auth process leads me to not auth page when I logged in
added pending for not implemented issue.
test: kakao auth process lets me correct connection between kakao account and email
test: kakao auth process shows me error message when I clicked expired activation link
session[:return_to] -> params[:redirect_url]
require_provider_token: redirect_url should be nested (bug fixed)
remove unused file
Merge branch 'develop' of github.com:DonutWorks/Ari into test/issue-154

Conflicts:
	Gemfile.lock
	app/controllers/activations_controller.rb
Merge pull request #250 from DonutWorks/test/issue-154

Test/issue 154
Merge branch 'develop' of github.com:DonutWorks/Ari into bug/issue-258

Conflicts:
	app/controllers/activations_controller.rb
	app/views/sessions/new.html.erb
test: kakao auth process redirects me to redirect_url of activation link
Merge pull request #259 from DonutWorks/bug/issue-258

session[:return_to] -> params[:redirect_url]
modified omniauth-kakao git url
login image button path using asset_path
fixed about go away redirect_url when do not agree kakao auth