Add webdriver and fixed travis build

.travis.yml

@@ -52,7 +52,7 @@ matrix:
     env: RUST_BACKTRACE=1
     before_script:
       - (test -x $HOME/.cargo/bin/cargo-install-update || cargo install cargo-update)
-      - (test -x $HOME/.cargo/bin/cargo-generate || cargo install --vers "^0.2" cargo-generate)
+      - (test -x $HOME/.cargo/bin/cargo-generate || cargo install --vers "0.2.2" cargo-generate)
       - cargo install-update -a
       - rustup target add wasm32-unknown-unknown
     script:

webdriver.json

@@ -0,0 +1,15 @@
+{
+  "moz:firefoxOptions": {
+    "prefs": {
+      "media.navigator.streams.fake": true,
+      "media.navigator.permission.disabled": true
+    },
+    "args": []
+  },
+  "goog:chromeOptions": {
+    "args": [
+      "--use-fake-device-for-media-stream",
+      "--use-fake-ui-for-media-stream"
+    ]
+  }
+}