add files for travis-ci

* Rails アプリを Travis CI で動かすためのメモ: http://bekkou68.hatenablog.com/entry/2014/03/14/225656
* RailsアプリをTravisCIでCIするまでの手順メモ:  http://qiita.com/knt45/items/1304bdd7a2f1d2f6a351
add Coveralls

* CoverallsでRailsアプリのテストのカバレッジ率を取得する手順メモ: http://qiita.com/knt45/items/58cacf895c0e5ad9228b
add Dockerfile
Using PostgreSQL on Travis CI

http://docs.travis-ci.com/user/using-postgresql/
Merge branch 'travis-ci' into coveralls
resolve conflict of README.md
Merge branch 'MiCHiLU-travis-ci'
resolve conflict of README.md
Merge branch 'MiCHiLU-coveralls'
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 'docker' into iss-431_catch_raise_error