Check in the vendor directory

Travis seems to be having issues pulling deps, so we'll have to check in
the vendor directory and prevent the makefile from trying to regenerate
it normally.

vendor/github.com/elazarl/go-bindata-assetfs/doc.go

@@ -0,0 +1,13 @@
+// assetfs allows packages to serve static content embedded
+// with the go-bindata tool with the standard net/http package.
+//
+// See https://github.com/jteeuwen/go-bindata for more information
+// about embedding binary data with go-bindata.
+//
+// Usage example, after running
+//    $ go-bindata data/...
+// use:
+//     http.Handle("/",
+//        http.FileServer(
+//        &assetfs.AssetFS{Asset: Asset, AssetDir: AssetDir, Prefix: "data"}))
+package assetfs