Cleanup travis and coverage script

Do not install git, tar and curl as these packages are installed by
default on Travis CI.  Move the codecov upload to the travis script and
do not include the codecov token as it's not needed when uploaded from
Travis CI.  Make the cover npm script into something that can be runned
locally and move the Travis CI version to a new ci-cover script.  Remove
the verbose flag from the tar extration of the factorio headless server.

.travis.yml

@@ -2,10 +2,10 @@ language: node_js
 node_js:
   - "9"
 before_install:
-  - sudo apt-get -qq update
-  - sudo apt-get install -y curl git tar
   - curl -o factorio.tar.gz -L https://www.factorio.com/get-download/latest/headless/linux64
-  - tar -xvf factorio.tar.gz
+  - tar -xf factorio.tar.gz
   - cp -n config.json.test config.json
+  - npm install -g codecov
 script:
-  - npm run cover
+  - npm run-script ci-cover
+  - codecov -f coverage/lcov.info

package.json

@@ -6,7 +6,8 @@
   "main": "master.js",
   "scripts": {
     "test": "mocha -R spec -- \"./{,!(node_modules)/**/}*.spec.js\" || true",
-    "cover": "nyc --reporter=lcovonly npm run-script test && codecov -f coverage/lcov.info -t f7b38085-36eb-4d72-84e6-64721910171e",
+    "cover": "nyc npm run-script test",
+    "ci-cover": "nyc --reporter=lcovonly npm run-script test",
     "start": "echo Run node client.js start [instance] to start slaves && node master.js",
     "install": "node lib/npmPostinstall.js",
     "bundle-dependencies": "bundle-dependencies"
@@ -25,7 +26,6 @@
     "body-parser": "^1.18.2",
     "cli": "^1.0.1",
     "cli-interact": "^0.1.9",
-    "codecov": "^3.0.1",
     "compression": "^1.7.2",
     "cookie-parser": "^1.4.3",
     "deepmerge": "^1.5.2",