I prefer my using statements inside my namespace. But the default class Template for a web application generates like the following:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace Tft.FlashCards.Entities
{
  public class Entity
  {
  }
}

The template used for a WebClass is located:
C:\Program Files (x86)\Microsoft Visual Studio 14.0\Common7\IDE\ItemTemplates\CSharp\Code\1033\WebClass\Class.cs

The default template is:

using System;
using System.Collections.Generic;
$if$ ($targetframeworkversion$ >= 3.5)using System.Linq;
$endif$using System.Web;

namespace $rootnamespace$
{
	public class $safeitemrootname$
	{
	}
}

I change this to:

namespace $rootnamespace$
{
	using System;
	using System.Collections.Generic;
	$if$ ($targetframeworkversion$ >= 3.5)using System.Linq;
	$endif$using System.Web;

	public class $safeitemrootname$
	{
	}
}

Stop all Visual Studio Instances and then from an elevated Developer command window execute devenv /installvstemplates

Restart VS and now the generated class is:

namespace Tft.FlashCards.Entities
{
  using System;
  using System.Collections.Generic;
  using System.Linq;
  using System.Web;

  public class Entity
  {
  }
}