Use coffee script for gulp

gulp/build.coffee

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+gulp = require 'gulp'
+
+gulp.task 'build', ['clean', 'styles', 'scripts', 'fonts', 'images']

gulp/clean.coffee

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+gulp = require 'gulp'
+del = require 'del'
+
+gulp.task 'clean', ->
+    del.sync 'output_*/assets/{css,fonts,images,js}'
+    del.sync gulp.config.outputDir + '/{css,fonts,images,js}'

gulp/default.coffee

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+gulp = require 'gulp'
+
+gulp.task 'default', ['build', 'watch']

gulp/fonts.coffee

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+gulp = require 'gulp'
+
+gulp.task 'fonts', ->
+    gulp.src gulp.config.bowerDir + '/font-awesome/fonts/*'
+        .pipe gulp.dest gulp.config.outputDir + '/fonts'

gulp/images.coffee

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+gulp = require 'gulp'
+
+gulp.task 'images', -> gulp.start 'copy-images', 'meetup-thumbnails'
+
+gulp.task 'meetup-thumbnails', ->
+    gulp.src gulp.config.assetsDir + '/images/meetups/originals/*'
+        .pipe gulp.plugins.imageResize height: '80'
+        .pipe gulp.dest gulp.config.outputDir + '/images/meetups/thumbnails'
+
+gulp.task 'copy-images', ->
+    gulp.copy gulp.config.assetsDir + '/images/**/*', gulp.config.outputDir + '/images'

gulp/minify-prod-html.coffee

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+gulp = require 'gulp'
+
+gulp.task 'minify-prod-html', ->
+  gulp.src 'output_prod/**/*.html'
+      .pipe gulp.plugins.htmlmin 'collapseWhitespace': true
+      .pipe gulp.dest 'output_prod'

gulp/scripts.coffee

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+gulp = require 'gulp'
+
+gulp.task 'scripts', ->
+    gulp.js [
+        gulp.config.bowerDir + '/jquery/dist/jquery.js',
+        gulp.config.bowerDir + '/bootstrap-sass/assets/javascripts/bootstrap.js',
+        gulp.config.assetsDir + '/' + gulp.config.jsPattern
+    ], 'site.js'

gulp/styles.coffee

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+gulp = require 'gulp'
+
+gulp.task 'styles', ->
+    gulp.css [
+      gulp.config.bowerDir + '/font-awesome/css/font-awesome.css',
+      gulp.config.assetsDir + '/sass/site.sass'
+    ], 'site.css'

gulp/watch.coffee

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+gulp = require 'gulp'
+
+gulp.task 'watch', ->
+    gulp.watch gulp.config.sassPattern, ['styles']
+    gulp.watch gulp.config.assetsDir + gulp.config.jsPattern, ['scripts']