Description of problem:
On small screen (1024x600 in my case), some anaconda's pages  doesn't fit in.
The identified pages are :
- Manual partitionnement
- Installation resume (more critical as important buttons (quit/continue installation) are not visible)
- Configuration page during installation.
- User creation.

Lower part of the page is not visible 

Version-Release number of selected component (if applicable):
Fedora-Live-Workstation-x86_64-21_Alpha-1.iso

How reproducible:
always on small screen.

Steps to Reproduce:
1. Boot on liveUSB.
2. Try to install fedora.

Actual results:
On small screen, some pages are not enterily visible.

Expected results:
Pages should be enterily visible. Or having a scroolbar.

Additional info:
Switch to "overview" mode in gnome-shell (super key) allow the user to see all the anaconda application (and so, all the screen).
User can still use buttons by using Tab + Enter keys.
Most of the time, there is enought place to let all elements fit on screen. We just have to waste less free space.
Anaconda window should never be bigger than screen size.