update several packages to address vulnerability warnings (prebid#2863)

* update coveralls and webdriver pacakges

* remove gulp-webdriver and webdriverio packages

* update additional packages to fix other vulnerabilities

package.json

@@ -30,7 +30,7 @@
     "babel-preset-env": "^1.6.1",
     "block-loader": "^2.1.0",
     "chai": "^3.3.0",
-    "coveralls": "^2.11.11",
+    "coveralls": "^3.0.1",
     "del": "^2.2.0",
     "documentation": "^5.2.2",
     "ejs": "^2.5.1",
@@ -46,7 +46,7 @@
     "gulp-babel": "^6.1.2",
     "gulp-clean": "^0.3.2",
     "gulp-concat": "^2.6.0",
-    "gulp-connect": "5.0.0",
+    "gulp-connect": "5.5.0",
     "gulp-documentation": "^3.2.1",
     "gulp-eslint": "^4.0.0",
     "gulp-footer": "^1.0.5",
@@ -59,7 +59,6 @@
     "gulp-shell": "^0.5.2",
     "gulp-uglify": "^3.0.0",
     "gulp-util": "^3.0.0",
-    "gulp-webdriver": "^1.0.1",
     "ignore-loader": "^0.1.2",
     "istanbul": "^0.4.5",
     "istanbul-instrumenter-loader": "^3.0.0",
@@ -88,7 +87,7 @@
     "mkpath": "^1.0.0",
     "mocha": "2.2.5",
     "mock-fs": "^3.11.0",
-    "nightwatch": "^0.9.5",
+    "nightwatch": "^1.0.6",
     "open": "0.0.5",
     "proxyquire": "^1.7.10",
     "querystringify": "0.0.3",