Update GitHub repository URL

[EvanDotPro]

Because you renamed the project, the repository URL for the project has
changed. In the browser, GitHub properly redirects to the new repo, but
if a user has the GitHub app installed, it simply says "Loading
repository failed!" because it simply takes the URL and parses that into
an API request. The GitHub API does not handle repository rename
redirects.

See:
http://stackoverflow.com/questions/22715169/github-api-returns-404-but-default-http-request-returns-301
https://github.com/github/android/blob/e18693727bc62bc2598cd7575130cbf3b8f341eb/app/src/main/java/com/github/mobile/ui/repo/RepositoryViewActivity.java#L121
https://github.com/github/android/blob/e18693727bc62bc2598cd7575130cbf3b8f341eb/app/src/main/java/com/github/mobile/core/repo/RefreshRepositoryTask.java#L55
https://github.com/eclipse/egit-github/blob/bcdf39cca5ef0dd828f960030a2febba1e56a253/org.eclipse.egit.github.core/src/org/eclipse/egit/github/core/service/RepositoryService.java#L580-L607

[EvanDotPro]

I thought about sending a pull request to the GitHub android app or egit-github to make it perform a HEAD request first to detect the 301 response and transparently use the new repo name, however, I don't think they'd like the idea of performing an extra HTTP request every time before reading repo details from the API.

Really, GitHub should just make their API respond to the old repo names with a 301 like the web interface does.

[plateaukao]

sorry for seeing this pull-request so late. seems that github will redirect it now. 👯