NPM: Replace deprecated packages

[driesd]

Deprecation warnings after running $ npm install

• npm WARN deprecated [email protected]: Please use gulp-cssnano instead.
• npm WARN deprecated [email protected]: graceful-fs version 3 and before will fail on newer node releases. Please update to graceful-fs@^4.0.0 as soon as possible.
• npm WARN deprecated [email protected]: lodash@<3.0.0 is no longer maintained. Upgrade to lodash@^4.0.0.
• npm WARN deprecated [email protected]: graceful-fs version 3 and before will fail on newer node releases. Please update to graceful-fs@^4.0.0 as soon as possible.
• npm WARN deprecated [email protected]: use cross-spawn or cross-spawn-async instead.
• npm WARN deprecated [email protected]: this package has been reintegrated into npm and is now out of date with respect to npm
• npm WARN deprecated [email protected]: This package has been renamed. Use lodash.padend@^4.0.0.
• npm WARN deprecated [email protected]: This package has been renamed. Use lodash.padstart@^4.0.0.