Fix branch API

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

lib/api/branches.rb

@@ -14,7 +14,7 @@ module API
       # Example Request:
       #   GET /projects/:id/repository/branches
       get ":id/repository/branches" do
-        present user_project.repo.heads.sort_by(&:name), with: Entities::RepoObject, project: user_project
+        present user_project.repository.branches.sort_by(&:name), with: Entities::RepoObject, project: user_project
       end
       # Get a single branch
@@ -25,7 +25,7 @@ module API
       # Example Request:
       #   GET /projects/:id/repository/branches/:branch
       get ':id/repository/branches/:branch', requirements: { branch: /.*/ } do
-        @branch = user_project.repo.heads.find { |item| item.name == params[:branch] }
+        @branch = user_project.repository.branches.find { |item| item.name == params[:branch] }
         not_found!("Branch does not exist") if @branch.nil?
         present @branch, with: Entities::RepoObject, project: user_project
       end

spec/models/wiki_page_spec.rb

@@ -36,7 +36,7 @@ describe WikiPage do
       end
       it "sets the version attribute" do
-        @wiki_page.version.should be_a Commit
+        @wiki_page.version.should be_a Grit::Commit
       end
     end
   end

spec/requests/api/branches_spec.rb

@@ -17,7 +17,7 @@ describe API::API, api: true  do
       get api("/projects/#{project.id}/repository/branches", user)
       response.status.should == 200
       json_response.should be_an Array
-      json_response.first['name'].should == project.repo.heads.sort_by(&:name).first.name
+      json_response.first['name'].should == project.repository.branch_names.first
     end
   end