Add support for compiling WebAssembly wasm32-unknown-unknown target (#92)

Note this only is the first step in web support, although the project compiles, it doesn't run!

Merging now to avoid branch divergence, until dependencies can be updated for wasm support.

* Add instructions to build for wasm32-unknown-unknown with wasm-pack in www/

* Update to rust-clipboard fork to compile with emscripten

aweinstock314/rust-clipboard#62

* Exclude reqwest dependency in wasm32

* Exclude compiling clipboard pasting on wasm32

* Exclude reqwest-using code from wasm32

* Install wasm target with rustup in Travis CI

* Update to collision 0.19.0

Fixes wasm incompatibility in deprecated rustc-serialize crate: rustgd/collision-rs#106

error[E0046]: not all trait items implemented, missing: `encode`
    --> github.com-1ecc6299db9ec823/rustc-serialize-0.3.24/src/serialize.rs:1358:1

* Increase travis_wait time even further, try 120 minutes

* Set RUST_BACKTRACE=1 in main

* Remove unused unneeded bzip2 features in zip crate

To fix wasm32-unknown-unknown target compile error:
error[E0432]: unresolved imports `libc::c_int`, `libc::c_uint`, `libc::c_void`, `libc::c_char`
 --> src/github.com-1ecc6299db9ec823/bzip2-sys-0.1.7/lib.rs:5:12
  |
5 | use libc::{c_int, c_uint, c_void, c_char};
  |            ^^^^^  ^^^^^^  ^^^^^^  ^^^^^^ no `c_char` in the root
  |            |      |       |
  |            |      |       no `c_void` in the root
  |            |      no `c_uint` in the root
  |            no `c_int` in the root

* flate2 use Rust backend

* Add console_error_panic_hook module for wasm backtraces

* Build using wasm-pack, wasm-bindgen, run with wasm-app

* Update to miniz_oxide 0.2.1, remove patch for Frommi/miniz_oxide#42

* Update to official clipboard crate since aweinstock314/rust-clipboard#62 was merged, but git revision pending release

* Update to branch of glutin attempting to build for wasm

iceiix/glutin#1

* Update winit dependency of glutin to git master

iceiix/winit#2

* Update to glutin branch with working (compiles, doesn't run) wasm_stub

* Add app name in title on web page

* Add wasm to Travis-CI test matrix

* Update glutin to fix Windows EGL compilation on AppVeyor

iceiix/glutin@9779735

Author: iceiix

protocol/mod.rs

@@ -19,6 +19,7 @@ use aes::Aes128;
 use cfb8::Cfb8;
 use cfb8::stream_cipher::{NewStreamCipher, StreamCipher};
 use serde_json;
+#[cfg(not(target_arch = "wasm32"))]
 use reqwest;
 
 pub mod mojang;
@@ -764,6 +765,7 @@ pub enum Error {
     Disconnect(format::Component),
     IOError(io::Error),
     Json(serde_json::Error),
+    #[cfg(not(target_arch = "wasm32"))]
     Reqwest(reqwest::Error),
 }
 
@@ -779,6 +781,7 @@ impl convert::From<serde_json::Error> for Error {
     }
 }
 
+#[cfg(not(target_arch = "wasm32"))]
 impl convert::From<reqwest::Error> for Error {
     fn from(e: reqwest::Error) -> Error {
         Error::Reqwest(e)
@@ -792,6 +795,7 @@ impl ::std::error::Error for Error {
             Error::Disconnect(_) => "Disconnect",
             Error::IOError(ref e) => e.description(),
             Error::Json(ref e) => e.description(),
+            #[cfg(not(target_arch = "wasm32"))]
             Error::Reqwest(ref e) => e.description(),
         }
     }
@@ -804,6 +808,7 @@ impl ::std::fmt::Display for Error {
             Error::Disconnect(ref val) => write!(f, "{}", val),
             Error::IOError(ref e) => e.fmt(f),
             Error::Json(ref e) => e.fmt(f),
+            #[cfg(not(target_arch = "wasm32"))]
             Error::Reqwest(ref e) => e.fmt(f),
         }
     }

protocol/mojang.rs

@@ -14,6 +14,7 @@
 
 use sha1::{self, Digest};
 use serde_json::json;
+#[cfg(not(target_arch = "wasm32"))]
 use reqwest;
 
 #[derive(Clone, Debug)]
@@ -28,6 +29,7 @@ const LOGIN_URL: &str = "https://authserver.mojang.com/authenticate";
 const REFRESH_URL: &str = "https://authserver.mojang.com/refresh";
 const VALIDATE_URL: &str = "https://authserver.mojang.com/validate";
 
+#[cfg(not(target_arch = "wasm32"))]
 impl Profile {
     pub fn login(username: &str, password: &str, token: &str) -> Result<Profile, super::Error> {
         let req_msg = json!({