implement twitter/facebook login & add username
auto create avatar & design login form
add config file
sign in -> login
Merge branch 'master' of github.com:bbugguj/vsns into subicura

Conflicts:
	README.md
hotfixed wmd-editor turbolinks
added public/assets
Merge branch 'master' of github.com:dev-study/vsns
merge origin master
Merge branch 'hschoi'
updated assets precompiled
added spinner to like
updated README.md
Merge branch 'master' of github.com:hschoidr/vsns
added spinner to Like link
upstream 최신 버전과 merge
Merge pull request #14 from bbugguj/master

걸음마 유닛 작업 내용 => facebook, twitter 연동
hotfixed other turbolinks
hotfixed other turbolinks
Merge branch 'master' of github.com:hschoidr/vsns