add convenient methods to change a state of an issue

lib/gitlab/client/issues.rb

@@ -65,5 +65,31 @@ def create_issue(project, title, options={})
     def edit_issue(project, id, options={})
       put("/projects/#{project}/issues/#{id}", :body => options)
     end
+
+    # Closes an issue.
+    #
+    # @example
+    #   Gitlab.close_issue(3, 42)
+    #   Gitlab.close_issue('gitlab', 42)
+    #
+    # @param  [Integer, String] project The ID or code name of a project.
+    # @param  [Integer] id The ID of an issue.
+    # @return [Gitlab::ObjectifiedHash] Information about closed issue.
+    def close_issue(project, id)
+      put("/projects/#{project}/issues/#{id}", :body => {:closed => 1})
+    end
+
+    # Reopens an issue.
+    #
+    # @example
+    #   Gitlab.reopen_issue(3, 42)
+    #   Gitlab.reopen_issue('gitlab', 42)
+    #
+    # @param  [Integer, String] project The ID or code name of a project.
+    # @param  [Integer] id The ID of an issue.
+    # @return [Gitlab::ObjectifiedHash] Information about reopened issue.
+    def reopen_issue(project, id)
+      put("/projects/#{project}/issues/#{id}", :body => {:closed => 0})
+    end
   end
 end

spec/gitlab/client/issues_spec.rb

@@ -85,4 +85,38 @@
       @issue.assignee.name.should == "Jack Smith"
     end
   end
+
+  describe ".close_issue" do
+    before do
+      stub_put("/projects/3/issues/33", "issue")
+      @issue = Gitlab.close_issue(3, 33)
+    end
+
+    it "should get the correct resource" do
+      a_put("/projects/3/issues/33").
+        with(:body => {:closed => '1'}).should have_been_made
+    end
+
+    it "should return information about an edited issue" do
+      @issue.project_id.should == 3
+      @issue.assignee.name.should == "Jack Smith"
+    end
+  end
+
+  describe ".reopen_issue" do
+    before do
+      stub_put("/projects/3/issues/33", "issue")
+      @issue = Gitlab.reopen_issue(3, 33)
+    end
+
+    it "should get the correct resource" do
+      a_put("/projects/3/issues/33").
+        with(:body => {:closed => '0'}).should have_been_made
+    end
+
+    it "should return information about an edited issue" do
+      @issue.project_id.should == 3
+      @issue.assignee.name.should == "Jack Smith"
+    end
+  end
 end