Support branches in git repository url

[gzip]

It'd be nice to be able to specify a branch, e.g.
git@github.com:foo/bar.git#mybranch

But the generate page treats this as an error.
'This is invalid git url. Valid format is "git@github.com:foo/bar.git"'

[h13i32maru]

@gzip Hi! Thanks for this issue.
Sorry, now hosting does not support branch.
I consider it.