Updating context and fixing permission issues

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.

routers/api/v1/repo_file.go

@@ -12,7 +12,7 @@ import (
 )
 
 func GetRepoRawFile(ctx *middleware.Context) {
-	if ctx.Repo.Repository.IsPrivate && !ctx.Repo.HasAccess {
+	if !ctx.Repo.HasAccess() {
 		ctx.Error(404)
 		return
 	}