Upgrading server dependancies (#6431)

vendor/github.com/gorilla/mux/.travis.yml

@@ -9,6 +9,7 @@ matrix:
     - go: 1.5
     - go: 1.6
     - go: 1.7
+    - go: 1.8
     - go: tip
 
 install:

vendor/github.com/gorilla/mux/README.md

@@ -2,6 +2,7 @@ gorilla/mux
 ===
 [![GoDoc](https://godoc.org/github.com/gorilla/mux?status.svg)](https://godoc.org/github.com/gorilla/mux)
 [![Build Status](https://travis-ci.org/gorilla/mux.svg?branch=master)](https://travis-ci.org/gorilla/mux)
+[![Sourcegraph](https://sourcegraph.com/github.com/gorilla/mux/-/badge.svg)](https://sourcegraph.com/github.com/gorilla/mux?badge)
 
 ![Gorilla Logo](http://www.gorillatoolkit.org/static/images/gorilla-icon-64.png)
 

vendor/github.com/gorilla/mux/bench_test.go

@@ -24,7 +24,7 @@ func BenchmarkMux(b *testing.B) {
 func BenchmarkMuxAlternativeInRegexp(b *testing.B) {
 	router := new(Router)
 	handler := func(w http.ResponseWriter, r *http.Request) {}
-	router.HandleFunc("/v1/{v1:(a|b)}", handler)
+	router.HandleFunc("/v1/{v1:(?:a|b)}", handler)
 
 	requestA, _ := http.NewRequest("GET", "/v1/a", nil)
 	requestB, _ := http.NewRequest("GET", "/v1/b", nil)

vendor/github.com/gorilla/mux/mux_test.go

@@ -1393,7 +1393,7 @@ func TestSubrouterErrorHandling(t *testing.T) {
 func TestPanicOnCapturingGroups(t *testing.T) {
 	defer func() {
 		if recover() == nil {
-			t.Errorf("(Test that capturing groups now fail fast) Expected panic, however test completed sucessfully.\n")
+			t.Errorf("(Test that capturing groups now fail fast) Expected panic, however test completed successfully.\n")
 		}
 	}()
 	NewRouter().NewRoute().Path("/{type:(promo|special)}/{promoId}.json")

vendor/github.com/gorilla/mux/route.go

@@ -153,7 +153,7 @@ func (r *Route) addRegexpMatcher(tpl string, matchHost, matchPrefix, matchQuery
 	}
 	r.regexp = r.getRegexpGroup()
 	if !matchHost && !matchQuery {
-		if tpl == "/" && (len(tpl) == 0 || tpl[0] != '/') {
+		if len(tpl) > 0 && tpl[0] != '/' {
 			return fmt.Errorf("mux: path must start with a slash, got %q", tpl)
 		}
 		if r.regexp.path != nil {