Cache templates

[dotlouis]

See

• http://stackoverflow.com/questions/12346690/is-there-a-way-to-make-angularjs-load-partials-in-the-beginning-and-not-at-when
• http://ionicframework.com/docs/api/provider/$ionicConfigProvider/
• https://github.com/angular-ui/ui-router/wiki#templates
• https://github.com/karma-runner/karma-ng-html2js-preprocessor

[dotlouis]

Apparently ionic already cache templates: https://github.com/driftyco/ionic/commit/944a92b08d40a7a4fb7e1e4727af9a2f8df3774f