fix(build): revert some build script changes to make building on go 1.4 work again

build.go

@@ -328,9 +328,9 @@ func build(pkg string, tags []string) {
 func ldflags() string {
 	var b bytes.Buffer
 	b.WriteString("-w")
-	b.WriteString(fmt.Sprintf(" -X main.version=%s", version))
-	b.WriteString(fmt.Sprintf(" -X main.commit=%s", getGitSha()))
-	b.WriteString(fmt.Sprintf(" -X main.buildstamp=%d", buildStamp()))
+	b.WriteString(fmt.Sprintf(" -X main.version %s", version))
+	b.WriteString(fmt.Sprintf(" -X main.commit %s", getGitSha()))
+	b.WriteString(fmt.Sprintf(" -X main.buildstamp %d", buildStamp()))
 	return b.String()
 }