Vendor dependencies

Let's see how I like this workflow.

vendor/wasm-bindgen/tests/wasm/main.rs

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+#![cfg(target_arch = "wasm32")]
+
+extern crate js_sys;
+extern crate wasm_bindgen;
+extern crate wasm_bindgen_test;
+extern crate wasm_bindgen_test_crate_a;
+extern crate wasm_bindgen_test_crate_b;
+
+#[cfg(feature = "serde-serialize")]
+#[macro_use]
+extern crate serde_derive;
+
+use wasm_bindgen::prelude::*;
+
+pub mod api;
+pub mod arg_names;
+pub mod bigint;
+pub mod char;
+pub mod classes;
+pub mod closures;
+pub mod comments;
+pub mod duplicate_deps;
+pub mod duplicates;
+pub mod enums;
+#[path = "final.rs"]
+pub mod final_;
+pub mod futures;
+pub mod getters_and_setters;
+pub mod import_class;
+pub mod imports;
+pub mod intrinsics;
+pub mod js_keywords;
+pub mod js_objects;
+pub mod jscast;
+pub mod math;
+pub mod no_shims;
+pub mod node;
+pub mod option;
+pub mod optional_primitives;
+pub mod result;
+pub mod result_jserror;
+pub mod rethrow;
+pub mod simple;
+pub mod slice;
+pub mod structural;
+pub mod truthy_falsy;
+pub mod usize;
+pub mod validate_prt;
+pub mod variadic;
+pub mod vendor_prefix;
+
+// should not be executed
+#[wasm_bindgen(start)]
+pub fn start() {
+    panic!();
+}