feat(typings): mark void methods in angular2.d.ts

Previously, when a return type was missing it
could have been any. But following #2746 we
require return types so remaining untyped returns
must be void.

Author: alexeagle

docs/dgeni-package/templates/type-definition.template.html

@@ -43,7 +43,7 @@
     {$ member.name $}
     {%- if member.optional %}?{% endif -%}
     {%- if member.parameters %}({% for param in member.parameters %}{$ param $}{% if not loop.last %}, {% endif %}{% endfor %}){%- endif %}
-    {%- if member.returnType %}: {$ member.returnType $}{%- else -%}: any{% endif -%}
+    {%- if member.returnType %}: {$ member.returnType $}{%- else -%}: void{% endif -%}
     ;
   {%- endfor %}
   }

modules/angular2/src/forms/directives/ng_model.ts

@@ -63,7 +63,7 @@ export class NgModel extends NgControl {
     }
   }
 
-  get control() { return this._control; }
+  get control(): Control { return this._control; }
 
   get path(): List<string> { return []; }