Beers sample: Fix cell selection bug

Previously, in the "Beers" sample, if the user clicked on a row of the
list of beers, that row wuold remain highlighted in blue.
Fonts app: improved selection UI

As with most iPhone apps, now when you click the "Back" button to
return to the full list of fonts, the previously-selected font
momentarily blinks blue (selected), and then quickly fades out.
Merge branch 'tableview-fixes' of https://github.com/mmorearty/RubyMotionSamples into mmorearty-tableview-fixes
Merge branch 'mmorearty-tableview-fixes'