fix(generator): Fix broken template reference in index.html by runnin…

…g it through Yeoman engine

app/index.js

@@ -118,7 +118,7 @@ IonicGenerator.prototype.setupEnv = function setupEnv() {
 };
 
 IonicGenerator.prototype.readIndex = function readIndex() {
- this.indexFile = this.read(path.join(this.starterCache, 'index.html'));
+ this.indexFile = this.engine(this.read(path.join(this.starterCache, 'index.html')), this);
 };
 
 IonicGenerator.prototype.appJs = function appJs() {