gulpfile: Reformat, remove unused packages
package.json: Update devDependencies
Merge pull request #1931 from mc10/gulpfile

Clean up Gulpfile, update devDependencies
Added 4.5.4 to changelog.txt
Convert $.map to native arr.map
Merge pull request #1933 from mc10/functional

Convert $.map to native arr.map
Merge pull request #1932 from allthefoxes/changelog

Added 4.5.4 to changelog.txt
changelog.js: Add 4.5.4
Merge pull request #1935 from mc10/changelog

changelog.js: Add 4.5.4