Use vendor when building (#201)

* Use vendor code for all go calls

* Add missing vendor dependencies

* Add travis_retry to yarn install

* Fix go test call

vendor/github.com/99designs/gqlgen/codegen/args.gotpl

@@ -0,0 +1,43 @@
+{{ range $name, $args := .Args }}
+func (ec *executionContext) {{ $name }}(ctx context.Context, rawArgs map[string]interface{}) (map[string]interface{}, error) {
+	var err error
+	args := map[string]interface{}{}
+	{{- range $i, $arg := . }}
+		var arg{{$i}} {{ $arg.TypeReference.GO | ref}}
+		if tmp, ok := rawArgs[{{$arg.Name|quote}}]; ok {
+			{{- if $arg.Directives }}
+				getArg0 := func(ctx context.Context) (interface{}, error) { return ec.{{ $arg.TypeReference.UnmarshalFunc }}(ctx, tmp) }
+
+				{{- range $i, $directive := $arg.Directives }}
+					getArg{{add $i 1}} := func(ctx context.Context) (res interface{}, err error) {
+						{{- range $dArg := $directive.Args }}
+							{{- if and $dArg.TypeReference.IsPtr ( notNil "Value" $dArg ) }}
+								{{ $dArg.VarName }} := {{ $dArg.Value | dump }}
+							{{- end }}
+						{{- end }}
+						n := getArg{{$i}}
+						return ec.directives.{{$directive.Name|ucFirst}}({{$directive.ResolveArgs "tmp" "n" }})
+					}
+				{{- end }}
+
+				tmp, err = getArg{{$arg.Directives|len}}(ctx)
+				if err != nil {
+					return nil, err
+				}
+				if data, ok := tmp.({{ $arg.TypeReference.GO | ref }}) ; ok {
+					arg{{$i}} = data
+				} else {
+					return nil, fmt.Errorf(`unexpected type %T from directive, should be {{ $arg.TypeReference.GO }}`, tmp)
+				}
+			{{- else }}
+				arg{{$i}}, err = ec.{{ $arg.TypeReference.UnmarshalFunc }}(ctx, tmp)
+				if err != nil {
+					return nil, err
+				}
+			{{- end }}
+		}
+		args[{{$arg.Name|quote}}] = arg{{$i}}
+	{{- end }}
+	return args, nil
+}
+{{ end }}