Delete unused gulp plugin

frontend/gulpfile-img64.js

@@ -1,56 +0,0 @@
-var cheerio = require("cheerio");
-var through = require('through2');
-var mime = require('mime');
-var path = require('path');
-var fs = require('fs');
-var gutil = require('gulp-util');
-
-function replacePath(ssrc, file) {
-	var isdata = ssrc.indexOf("data");
-	if (ssrc != "" && typeof ssrc != 'undefined' && isdata !== 0) {
-		var spath = path.isAbsolute(ssrc) ? path.join(file.base, ssrc) : path.resolve(path.dirname(file.path), ssrc);
-		var mtype = mime.lookup(spath);
-		if (mtype != 'application/octet-stream') {
-			var sfile = fs.readFileSync(spath);
-			var simg64 = new Buffer(sfile).toString('base64');
-			return 'data:' + mtype + ';base64,' + simg64;
-		}
-	}
-}
-
-module.exports = function() {
-	return through.obj(function(file, enc, callback) {
-		if (file.isNull()) {
-			this.push(file);
-			// do nothing if no contents
-			return callback();
-		}
-
-		if (file.isStream()) {
-			this.emit('error', new gutil.PluginError('gulp-img64', 'Streaming not supported'));
-			return callback();
-		}
-
-		if (file.isBuffer()) {
-			var $ = cheerio.load(String(file.contents), {
-				xmlMode: mime.lookup(file.path) == "application/xml"
-			});
-
-			$('img').each(function() {
-				$(this).attr('src', replacePath($(this).attr('src'), file));
-			});
-
-			$('link[rel~=icon]').each(function() {
-				$(this).attr('href', replacePath($(this).attr('href'), file));
-			});
-
-			$('OpenSearchDescription Image').each(function() {
-				$(this).text(replacePath($(this).text(), file));
-			});
-
-			file.contents = new Buffer($.html());
-
-			return callback(null, file);
-		}
-	});
-};