add Dockerfile
Merge branch 'master' into docker
use postgres
update Gemfile.lock
update coveralls 0.7.1
remove mysql
update Dockerfile
use fig
add documents for docker
fix for test
fix
Merge branch 'master' into docker

Conflicts:
	Gemfile
	Gemfile.lock
Merge branch 'master' into docker

Conflicts:
	README.md
fix, removed config/omniauth.yml.sample
add retrying bundle install
Merge pull request #450 from MiCHiLU/docker

Docker対応