title: Visual Studio 2015 is not auto completing Unity keywords
body: <p>I've installed Visual Studio 2015 and Visual Studio 2015 Tools for Unity and I had no problem in using Visual Studio as my default editor in Unity, however I've noticed that Unity's keywords and methods do not auto complete, only the VS do.</p>
  
  <p>For example: <code>GetComponent&lt;&gt;</code>, or <code>OnGui()</code> and <code>Input.GetMouseButton</code>, these are specifically from Unity, when I was using MonoDevelop it displayed the available options of methods when I was typing <code>Input.GetMouse</code>... and if I clicked CTRL + Space it auto completed.</p>
  
  <p>I would like to know if is there any way that I can make Visual Studio recognize Unity API.
  Since I am new in Unity and C# I don't know if this is a default behavior, if I should set up something to enable this auto complete feature or if something is wrong and it should be working and somehow it is not.</p>
  
  <p>I would appreciate any help.
  Thanks in advance.</p>