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
Merge pull request #190 from kmiyake/iss-97_change_assignee_list_according_to_context

Change assignee list according to context