Add code coverage via CodeCov.io.

Author: nlutsenko

.travis.yml

@@ -7,4 +7,4 @@ node_js:
   - "4.2"
 env:
   - MONGODB_VERSION=3.0.8
-after_script: cat ./coverage/coverage-final.json
+after_success: ./node_modules/.bin/codecov

package.json

@@ -22,6 +22,7 @@
     "request": "^2.65.0"
   },
   "devDependencies": {
+    "codecov": "^1.0.1",
     "istanbul": "^0.4.2",
     "jasmine": "^2.3.2",
     "mongodb-runner": "^3.1.15"