#452 Added rouding to calculated sizes
#452 Deleted CSS output so it must always be generated from Stylus
#452 Delegate vendorizing properties to Autoprefixer
#452 More reasonable Gulp settings
#452 Remove vendor files from sources folder
#452 Deleted JS output so it must always be recompiled from source files
#452 Separated source files from build files more clearly
#452 Use nib when compiling Stylus to CSS
#452 Renamed assets folder to built_assets for clarification
#452 Again removing the built assets from git
#452 Make utility classes adhere to styleguide
#452 Make CSS class names adhere to styleguide
#452 Fixed JSHint warning
#452 Make JS handler class names adhere to styleguide
Merge pull request #453 from laterpay/feature/452_improve_css_architecture_and_tooling

Feature/452 improve css architecture and tooling
#434. Backmerged with master.
Merge branch 'feature/434_save_bulk_operations' of github.com:laterpay/laterpay-wordpress-plugin into feature/434_save_bulk_operations