Just had this same problem. No icon so I couldn't pause or delete the app but I have a fix that doesn't require you to restore or anything.
Settings> general>usage>shiw all apps.
The stalled apps should show up in this list and you can delete them from there and redownload again.
Here's the real answer. For apps that are stuck installing and are stuck with the "installing" button frozen here's what you do and yes it's easy and no you don't have to reset. Plug your ipad into your computer. Open itunes. go to your ipad and to the apps tab. The ipad desktop emulation appears on the right, to the left is the list of apps. They say install if they are not on your ipad. They say remove if they are on it. They say update if they need updating. Click the update button on all the ones that say update, they will now say Will Update. Now apply and it will fix them all.