fix(loader): rm unnecessary this.cacheable (caching) (#530)

Author: michael-ciniawsky

loader.js

@@ -13,12 +13,10 @@ var LimitChunkCountPlugin = require("webpack/lib/optimize/LimitChunkCountPlugin"
 var NS = fs.realpathSync(__dirname);
 
 module.exports = function(source) {
-	if(this.cacheable) this.cacheable();
 	return source;
 };
 
 module.exports.pitch = function(request) {
-	if(this.cacheable) this.cacheable();
 	var query = loaderUtils.getOptions(this) || {};
 	var loaders = this.loaders.slice(this.loaderIndex + 1);
 	this.addDependency(this.resourcePath);