added download attr to download links on homepage
added download attr to download links on homepage

same as https://github.com/emberjs/website/pull/1490
according to https://developer.mozilla.org/en-US/docs/Web/HTML/Element/a#attr-download the download attribute tells your browser to download the file, rather than opening in a separate tab/window, which then requires you to save.
koriroys/emberjs-website,shearwater-intl/website,MinxianLi/ember,josemarluedke/ember-website,datajohnny/website,shearwater-intl/website,quangv/website,SaladFork/emberjs-website,EricSchank/website,bmac/website,quangv/website,davidpett/website,AaronSikes/website,kpfefferle/website,ktornwall/website,greyhwndz/website,maxcal/website,balupton/ember-website,shearwater-intl/website,wifelette/website,elwayman02/website,SaladFork/emberjs-website,rwjblue/website,kkenan/website,cyberkoi/website,cyberkoi/website,MinxianLi/ember,zeppelin/emberjs-website,maxcal/website,koriroys/emberjs-website,AgilionApps/website,knownasilya/website,elidupuis/website,zeppelin/emberjs-website,martndemus/website,zeppelin/emberjs-website,ktornwall/website,greyhwndz/website,AaronSikes/website,josemarluedke/ember-website,martndemus/website,cllns/emberjs-website,josemarluedke/ember-website,workmanw/ember-website,quangv/website,EricSchank/website,wifelette/website,kkenan/website,kkenan/website,rwjblue/website,datajohnny/website,balupton/ember-website,wifelette/website,koriroys/emberjs-website,ktornwall/website,greyhwndz/website,balupton/ember-website,workmanw/ember-website,josemarluedke/ember-website,raycohen/website,tmock12/website,tmock12/website,elwayman02/website,workmanw/ember-website,kpfefferle/website,duggiefresh/website,duggiefresh/website,elidupuis/website,Eric-Guo/website,raycohen/website,mrjavascript/website,SaladFork/emberjs-website,AaronSikes/website,martndemus/website,raycohen/website,MinxianLi/ember,zeppelin/emberjs-website,knownasilya/website,workmanw/ember-website,cllns/emberjs-website,Eric-Guo/website,elwayman02/website,tmock12/website,AgilionApps/website,jimmay5469/website,cllns/emberjs-website,Nick-Cotter/aboutme,EricSchank/website,cyberkoi/website,duggiefresh/website,jimmay5469/website,kpfefferle/website,SaladFork/emberjs-website,datajohnny/website,bmac/website,davidpett/website,jimmay5469/website,bmac/website,maxcal/website,bmac/website,Eric-Guo/website,mrjavascript/website,Nick-Cotter/aboutme,elidupuis/website,mrjavascript/website,AgilionApps/website,davidpett/website