refactor view

line separator ->  br
autolink
use the simple_format
Merge pull request #12 from sue445:feature/autolink

However, line break replace by simple_format
Specify ruby version 2.0.0
Upgrade to ruby 2.1.0
Merge pull request #13 from sue445/feature/upgrade_to_2.1.0

Upgrade to ruby 2.1.0
Update padrino to 0.11.4
Update README.md
Merge pull request #14 from tyabe/update_padrino

Update padrino to 0.11.4
Update gems
Merge pull request #15 from tyabe/update_gems

Update gems
Add travis
Setup default rake task
Change used database on test environments
Add coveralls
Update README.md
Convert haml to slim
Merge pull request #16 from tyabe/convert_haml_to_slim

Convert haml to slim