Update `wiredep`

New features include default support for Less, as well as bug fixes including
- custom fileTypes are now supported
- relative file paths from b_c to source file
Remove bundle task.

gulp-bundle is deprecated. gulp-useref now has the ability to concatenate assets inside build blocks and pass them to the stream. Minification of assets is now handled in the gulpfile instead of gulp-bundle. gulp-filter is required to handle filtering the stream for asset minification.