Admin who is github user can add github repository
Separate new issue form and edit issue form
Select member according to project status
Refresh assignee list if change add or not github
Fix bug that occurred crowdworks_url is nil

And fix undesirable code
Refresh assignee list if change add or not github
Fix failed test and undesirable code
Remove whitespace
Create github_members method for remove duplicate code
Tweak design of issue
Fix bug

別チケットでタイムカードを開始したときにチケット情報が置き換わらないバグ
を修正
Merge pull request #192 from kmiyake/iss-144_improve_the_usability

Improve usability on the top page
Fix bug that occurred because of incorrect merge
Merge pull request #193 from kmiyake/hotfix

Fix bug that occurred because of incorrect merge
Merge pull request #190 from kmiyake/iss-97_change_assignee_list_according_to_context

Change assignee list according to context
Fix way to get bootstrap view
Merge pull request #194 from kmiyake/iss-189_fix_way_to_bootstrap

Fix way to get bootstrap view
Merge pull request #183 from kmiyake/iss-111_only_github_user_can_add_repo

Admin who is github user can add github repository
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