Added gulp.js build

.gitignore

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+dist
+node_modules

gulpfile.js

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+var gulp = require('gulp'),
+    concat = require('gulp-concat'),
+    rename = require('gulp-rename'),
+    uglify = require('gulp-uglify'),
+    cleanCSS = require('gulp-clean-css'),
+    es = require('event-stream');
+
+var src = 'src/**/*.js',
+    dest = 'dist';
+
+gulp.task('scripts', function() {
+  var js = gulp.src(src)
+    .pipe(concat('timerange-selector.js'))
+    .pipe(gulp.dest('dist'))
+    .pipe(rename('timerange-selector.min.js'))
+    .pipe(uglify())
+    .pipe(gulp.dest('dist'));
+
+  var font = gulp.src('src/griphandle.ttf')
+    .pipe(gulp.dest('dist'));
+
+  var css = gulp.src('src/timerange-selector.css')
+    .pipe(cleanCSS())
+    .pipe(rename('timerange-selector.min.css'))
+    .pipe(gulp.dest('dist'));
+
+  return es.concat(js, font, css);
+});
+
+gulp.task('default', ['scripts'], function() {});