Use travis matrix

.travis.yml

@@ -5,7 +5,12 @@ node_js:
   - "4"
   - "5"
   - "6"
+env: 
+  - WEBPACK=webpack
+  - WEBPACK=webpack@beta
+install:
+  - npm install --ignore-scripts
+  - npm rm webpack
+  - npm install $WEBPACK --ignore-scripts || true
 script:
-  - npm test
-  - npm rm webpack && npm i webpack@beta || true
-  - npm test
+  - npm test

spec/BasicSpec.js

@@ -20,7 +20,7 @@ var HtmlWebpackPlugin = require('../index.js');
 
 var OUTPUT_DIR = path.join(__dirname, '../dist');
 
-jasmine.getEnv().defaultTimeoutInterval = 5000;
+jasmine.getEnv().defaultTimeoutInterval = 10000;
 
 function testHtmlPlugin (webpackConfig, expectedResults, outputFile, done, expectErrors, expectWarnings) {
   outputFile = outputFile || 'index.html';

spec/CachingSpec.js

@@ -18,6 +18,8 @@ var HtmlWebpackPlugin = require('../index.js');
 
 var OUTPUT_DIR = path.join(__dirname, '../dist');
 
+jasmine.getEnv().defaultTimeoutInterval = 10000;
+
 function setUpCompiler (htmlWebpackPlugin) {
   spyOn(htmlWebpackPlugin, 'evaluateCompilationResult').and.callThrough();
   var compiler = new WebpackRecompilationSimulator(webpack({

spec/ExampleSpec.js

@@ -20,7 +20,7 @@ var webpackMajorVersion = require('webpack/package.json').version.split('.')[0];
 
 var OUTPUT_DIR = path.join(__dirname, '../dist');
 
-jasmine.getEnv().defaultTimeoutInterval = 5000;
+jasmine.getEnv().defaultTimeoutInterval = 10000;
 
 function runExample (exampleName, done) {
   var examplePath = path.resolve(__dirname, '..', 'examples', exampleName);