Add smartinez87/exception_notification to notify exception
Fix bug that occurred crowdworks_url is nil

Because default setting of database migrattion is nil.

Therefore it should be use blank? method.
`nil` object is not have empty? method.
Merge pull request #195 from kmiyake/hotfix

Fix bug that occurred crowdworks_url is nil
Show projects list by backbone.js
Fix add gravatar_url method
Fix use gravatar_url
Merge pull request #198 from kmiyake/iss-197_show_projects_by_backbonejs

Show projects list by backbonejs
Remove dead code
Fix bug in bootstrap data on top page
Fix bug in truncate text
Fix bug in edit issue
Merge pull request #202 from kmiyake/iss-201_fix_bug_in_edit_issue

Fix bug in edit issue
Merge pull request #191 from kmiyake/iss-79_add_exception_notification

Add smartinez87/exception_notification to notify exception
Merge pull request #199 from kmiyake/iss-196_fix_bug_reload_top_page

Fix bug in bootstrap data on top page
Merge pull request #200 from kmiyake/iss-188_fix_bug_in_shorten_link_href

Fix bug in truncate text