Raise NotFound instead of RestClient::ResourceNotFound

When attempting to load a repo that does not exist or is not visible to the
logged-in user.

lib/github_v3_api/repos_api.rb

@@ -40,6 +40,8 @@ def list
     def get(user, repo_name)
       org_data = @connection.get("/repos/#{user}/#{repo_name}")
       GitHubV3API::Repo.new_with_all_data(self, org_data)
+    rescue RestClient::ResourceNotFound
+      raise NotFound, "The repository #{user}/#{repo_name} does not exist or is not visible to the user."
     end
   end
 end

spec/repos_api_spec.rb

@@ -21,5 +21,13 @@
       GitHubV3API::Repo.should_receive(:new_with_all_data).with(api, :repo_hash).and_return(:repo)
       api.get('octocat', 'hello-world').should == :repo
     end
+
+    it 'raises GitHubV3API::NotFound instead of a RestClient::ResourceNotFound' do
+      connection = mock(GitHubV3API)
+      connection.should_receive(:get) \
+        .and_raise(RestClient::ResourceNotFound)
+      api = GitHubV3API::ReposAPI.new(connection)
+      lambda { api.get('octocat', 'hello-world') }.should raise_error(GitHubV3API::NotFound)
+    end
   end
 end