Update dependencies

[melv-n]

When running npm install a lot of warnings for packages with security vulnerabilities/deprecations come up:

npm WARN deprecated cross-spawn-async@2.0.0: cross-spawn no longer requires a build toolchain, use it instead!
npm WARN deprecated autoprefixer-loader@3.2.0: Please use postcss-loader instead of autoprefixer-loader
npm WARN deprecated minimatch@2.0.10: Please update to minimatch 3.0.2 or higher to avoid a RegExp DoS issue
npm WARN deprecated tough-cookie@2.2.2: ReDoS vulnerability parsing Set-Cookie https://nodesecurity.io/advisories/130
npm WARN deprecated npmconf@2.1.2: this package has been reintegrated into npm and is now out of date with respect to npm
npm WARN deprecated cross-spawn-async@2.2.4: cross-spawn no longer requires a build toolchain, use it instead!
npm WARN deprecated minimatch@0.2.14: Please update to minimatch 3.0.2 or higher to avoid a RegExp DoS issue
npm WARN deprecated lodash@1.0.2: lodash@<3.0.0 is no longer maintained. Upgrade to lodash@^4.0.0.
npm WARN deprecated graceful-fs@1.2.3: graceful-fs v3.0.0 and before will fail on node releases >= v7.0. Please update to graceful-fs@^4.0.0 as soon as possible. Use 'npm ls graceful-fs' to find it in the tree.
npm WARN prefer global cover@0.2.9 should be installed with -g
npm WARN prefer global node-gyp@3.4.0 should be installed with -g