added apis for the admin of fork links

lib/gitlab/client/projects.rb

@@ -179,5 +179,29 @@ def edit_project_hook(project, id, url)
     def delete_project_hook(project, id)
       delete("/projects/#{project}/hooks/#{id}")
     end
+
+    # Mark this project as forked from the other
+    #
+    # @example
+    #   Gitlab.make_forked(42, 24)
+    #
+    # @param  [Integer, String] project The ID or code name of a project.
+    # @param  [Integer] project The ID of the project it is forked from
+    # @return [Gitlab::ObjectifiedHash] Information about the forked project.
+    def make_forked_from(project, forked_from_project)
+      post("/projects/#{project}/fork/#{forked_from_project}")
+    end
+
+    # Remove a forked_from relationship for a project.
+    #
+    # @example
+    #  Gitlab.remove_forked(42)
+    #
+    # @param  [Integer, String] project The ID or code name of a project.
+    # @param  [Integer] project The ID of the project it is forked from
+    # @return [Gitlab::ObjectifiedHash] Information about the forked project.
+    def remove_forked(project)
+      delete("/projects/#{project}/fork")
+    end
   end
 end

spec/fixtures/project_fork_link.json

@@ -0,0 +1 @@
+{"created_at":"2013-07-03T13:51:48Z","forked_from_project_id":24,"forked_to_project_id":42,"id":1,"updated_at":"2013-07-03T13:51:48Z"}

spec/gitlab/client/projects_spec.rb

@@ -219,4 +219,35 @@
       @hook.url.should == "https://api.example.net/v1/webhooks/ci"
     end
   end
+
+  describe ".make_forked_from" do
+    before do
+      stub_post("/projects/42/fork/24", "project_fork_link")
+      @forked_project_link = Gitlab.make_forked_from(42, 24)
+    end
+
+    it "should get the correct resource" do
+      a_post("/projects/42/fork/24").should have_been_made
+    end
+
+    it "should return information about a forked project" do
+      @forked_project_link.forked_from_project_id.should == 24
+      @forked_project_link.forked_to_project_id.should == 42
+    end
+  end
+
+  describe ".remove_forked" do
+    before do
+      stub_delete("/projects/42/fork", "project_fork_link")
+      @forked_project_link = Gitlab.remove_forked(42)
+    end
+
+    it "should be sent to correct resource" do
+      a_delete("/projects/42/fork").should have_been_made
+    end
+
+    it "should return information about an unforked project" do
+      @forked_project_link.forked_to_project_id.should == 42
+    end
+  end
 end