- fix delete user but repository watches are not decreased

The boolean flags in the repo context have been replaced with mode and two methods

Also, the permissions have been brought more in line with https://help.github.com/articles/permission-levels-for-an-organization-repository/ , Admin Team members are able to change settings of their repositories.

- models/issue.go: format comment type names

Label, milestone, assignee ids are not includes in post request, possible
js or form building bug.

- UpdateAssignee
- UpdateIssueMilestone

Conflicts:
	modules/setting/setting.go

Conflicts:
	templates/repo/release/list.tmpl
	templates/user/dashboard/dashboard.tmpl

Conflicts:
	routers/repo/setting.go