更新了长短url表单对象，居中显示
规范导航栏，删除背景图片
form的action由后台决定
button为蓝色按钮
form的id修复
修改long_url获取方式
Merge branch 'new3' of https://github.com/jachinpy/Halley_Comet into form1
Merge branch 'form' into form1
Merge branch 'master' into form1
Merge pull request #28 from cpyou/form1

修改了前台long_url的输入框，修改了后台数据获取的方式