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 link to back the project
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'
Refactor code of relating crowdworks
Send time entry to Crowdworks through Backbone

fix #432
Remove dead code
Remove dead code
Refactor code

Projectは必ずロードされる
Handling exception of Github API Error
Merge pull request #446 from kmiyake/iss-432_send_time_entry_on_issues_show

Send time entry to Crowdworks on Issues#show
Merge pull request #448 from kmiyake/iss-431_catch_raise_error

Handling exception of Github API Error
Merge pull request #445 from kmiyake/iss-444_add_a_link_to_back_the_project

Add link to back the project
Merge pull request #449 from kmiyake/refactor_code

Refactor code