remove Glyphicons docs autogeneration from Grunt

Simplifies the build tooling a teeny bit.
This data file shouldn't need to be updated for v3 ever again.
This task will also be unnecessary in v4.

[skip sauce] [skip validator]

Gruntfile.js

@@ -18,7 +18,6 @@ module.exports = function (grunt) {
   var fs = require('fs');
   var path = require('path');
   var npmShrinkwrap = require('npm-shrinkwrap');
-  var generateGlyphiconsData = require('./grunt/bs-glyphicons-data-generator.js');
   var BsLessdocParser = require('./grunt/bs-lessdoc-parser.js');
   var generateRawFiles = require('./grunt/bs-raw-files-generator.js');
 
@@ -445,15 +444,13 @@ module.exports = function (grunt) {
   grunt.registerTask('dist', ['clean', 'dist-css', 'copy:fonts', 'dist-js', 'dist-docs']);
 
   // Default task.
-  grunt.registerTask('default', ['test', 'dist', 'build-glyphicons-data', 'build-customizer']);
+  grunt.registerTask('default', ['test', 'dist', 'build-customizer']);
 
   // Version numbering task.
   // grunt change-version-number --oldver=A.B.C --newver=X.Y.Z
   // This can be overzealous, so its changes should always be manually reviewed!
   grunt.registerTask('change-version-number', 'sed');
 
-  grunt.registerTask('build-glyphicons-data', function () { generateGlyphiconsData.call(this, grunt); });
-
   // task for building customizer
   grunt.registerTask('build-customizer', ['build-customizer-html', 'build-raw-files']);
   grunt.registerTask('build-customizer-html', 'jade');