500 Errors not handled properly

[pridkett]

When GitHub throws an error it's not processed properly. This will just cause the whole loader to crash out.

01:11:08 [main] ERROR n.w.r.g.AbstractInvocationHandler AbstractInvocationHandler.java:81 - Unhandled exception: Method: get Args: [/repos/technophobicgeek/Books-Around-You/contributors?per_page=100&page=1]
org.eclipse.egit.github.core.client.RequestException: Server Error (500)
        at org.eclipse.egit.github.core.client.GitHubClient.createException(GitHubClient.java:509) ~[org.eclipse.egit.github.core-1.3.0-SNAPSHOT-WAGSTROM.jar:na]
        at org.eclipse.egit.github.core.client.GitHubClient.get(GitHubClient.java:643) ~[org.eclipse.egit.github.core-1.3.0-SNAPSHOT-WAGSTROM.jar:na]
        at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source) ~[na:na]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.6.0_22]
        at java.lang.reflect.Method.invoke(Method.java:616) ~[na:1.6.0_22]
        at net.wagstrom.research.github.v3.ThrottledGitHubInvocationHandler.invoke(ThrottledGitHubInvocationHandler.java:61) ~[github-0.2-SNAPSHOT.jar:na]
        at $Proxy7.get(Unknown Source) [na:na]
        at org.eclipse.egit.github.core.client.PageIterator.next(PageIterator.java:173) [org.eclipse.egit.github.core-1.3.0-SNAPSHOT-WAGSTROM.jar:na]
        at org.eclipse.egit.github.core.service.GitHubService.getAll(GitHubService.java:151) [org.eclipse.egit.github.core-1.3.0-SNAPSHOT-WAGSTROM.jar:na]
        at org.eclipse.egit.github.core.service.GitHubService.getAll(GitHubService.java:135) [org.eclipse.egit.github.core-1.3.0-SNAPSHOT-WAGSTROM.jar:na]
        at org.eclipse.egit.github.core.service.RepositoryService.getContributors(RepositoryService.java:820) [org.eclipse.egit.github.core-1.3.0-SNAPSHOT-WAGSTROM.jar:na]
        at net.wagstrom.research.github.v3.RepositoryMinerV3.getContributors(RepositoryMinerV3.java:75) [github-0.2-SNAPSHOT.jar:na]
        at net.wagstrom.research.github.GitHubMain.main(GitHubMain.java:139) [github-0.2-SNAPSHOT.jar:na]
        at net.wagstrom.research.github.Github.run(Github.java:86) [github-0.2-SNAPSHOT.jar:na]
        at net.wagstrom.research.github.Github.main(Github.java:51) [github-0.2-SNAPSHOT.jar:na]