Get rid of unnecessary dependencies

[Awk34]

We should remove all the now-unnecessary dependencies from the package.json before the 4.0.0 release

[Koslun]

Can create a PR later in the week but here are some of them:

gulp-ng-annotate
gulp-ng-constant
gulp-typescript
gulp-uglify

[Awk34]

depcheck Shows me this on a default install:

$ depcheck
Unused dependencies
* bootstrap-sass
* bootstrap
* bootstrap-social
* angular-animate
* angular-aria
* font-awesome
* angular-validation-match
* babel-runtime
* socketio-jwt
Unused devDependencies
* bs-fullscreen-message
* babel-plugin-transform-runtime
* eslint
* gulp-add-src
* gulp-angular-templatecache
* gulp-autoprefixer
* gulp-cache
* gulp-concat
* gulp-filter
* gulp-clean-css
* gulp-ng-annotate
* gulp-rename
* gulp-svgmin
* gulp-uglify
* gulp-useref
* gulp-sass
* gulp-scss-lint
* utile
* webpack-dev-server
* ng-annotate-loader
* babel-loader
* css-loader
* file-loader
* imports-loader
* isparta-instrumenter-loader
* isparta-loader
* istanbul-instrumenter-loader
* null-loader
* postcss-loader
* raw-loader
* style-loader
* sass-loader
* tiny-lr
* istanbul

There's a lot in there I know we do use, but at least this provides a starting point