GitHub API URI does not show the saved value

Environment

* Jenkins 1.516, OpenJDK 7, Ubuntu Server 64bit 13.04
* github-oauth-plugin 0.14-SNAPSHOT 6b0449ccec7eec6ec5578fc0ffd1d89036062c09

Steps to reproduce

1. Open "Configure Global Security"
1. Select "Github Authentication Plugin" security realm
1. Set "GitHub API URI" "https://github.company.com/api/v3"
1. Save configuration
1. Reopen "Configure Global Security"
1. "GitHub API URI" is reset to "https://api.github.com"

Expected

* "GitHub API URI" should be "https://github.company.com/api/v3"