"#" in a branch name causes broken URLs in launchpad

[Karl Stenerud]

If a git branch has the "#" character in its name, launchpad generates broken URLs.

Offending Case:

Go to https://code.launchpad.net/~fermulator/ubuntu/+source/strongswan/+git/strongswan/
Click on "allow_charon_apparmor_read_proc_fd_LP_#1786250", which links to https://code.launchpad.net/~fermulator/ubuntu/+source/strongswan/+git/strongswan/+ref/allow_charon_apparmor_read_proc_fd_LP_#1786250

The URL will map to the standard "This page does not exist, or you may not have permission to see it." page.

However, replacing "#" with "%23" works: https://code.launchpad.net/~fermulator/ubuntu/+source/strongswan/+git/strongswan/+ref/allow_charon_apparmor_read_proc_fd_LP_%231786250