新增：里程碑接口

app/controllers/api/v1/issues/milestones_controller.rb

@@ -0,0 +1,31 @@
+class Api::V1::Issues::MilestonesController < Api::V1::BaseController 
+  before_action :require_public_and_member_above, only: [:index] 
+
+  # 里程碑列表
+  def index 
+    if params[:only_name]
+      @milestones = @project.versions
+    else 
+      @milestones = @project.versions.includes(:issues)
+    end
+    @milestones = kaminary_select_paginate(@milestones)
+  end 
+
+  # 里程碑详情
+  def show 
+  end
+
+  def create 
+  end
+
+  def update 
+  end
+
+  def destroy 
+  end
+
+
+  private 
+  
+
+end

app/views/api/v1/issues/milestones/_simple_detail.json.jbuilder

@@ -0,0 +1 @@
+json.(milestone, :id, :name)

app/views/api/v1/issues/milestones/index.json.jbuilder

@@ -0,0 +1,6 @@
+json.total_count @milestones.total_count
+json.milestones @milestones.each do |milestone| 
+  if params[:only_name]
+    json.partial! "simple_detail", locals: {milestone: milestone}
+  end
+end