Items to buy details page and other fixes

This pull request is about the list of items to buy:

- The right icon is now shown
- Only the title is visible on the list
- Clicking on the title takes to a details page where the item's note is shown
- It fixes the note/title not being shown if too long for the screen
- It fixes the non working button for custom rewards

It actually uses the same controller and html of habits, rewards, dailies and todos, simply it doesn't show the edit button. So we may change the name and the references from `task` to a more general `item` (controller, argument for ng-click..), but that's up to you.

![schermata del 2013-08-30 22 42 11](https://f.cloud.github.com/assets/589911/1060587/f206028c-11b4-11e3-8625-af4aedf83c22.png)
![schermata del 2013-08-30 23 04 10](https://f.cloud.github.com/assets/589911/1060716/c790eb54-11b7-11e3-8884-dbb548670d37.png)