Merge pull request #92 from orta/master

xcode 5.1 support
use gem install instead of update
give detail buttons 50% opacity untill highlighting cell, as discussed in #77
improve naming for button-highlighting method
fix autolayout issues
set buttons alpha to zero until hovering over their containing cell
clean up
position detail buttons vertically centered
static const > define
Merge pull request #90 from mneorr/detailsbuttons-highlight

fix detail button opacity animations
remove cocoapods installation
kill installing pods, travis does it automatically
fix alignment issues in nib
make  a button and display all packages
toggle between buttons to filter packages
Merge pull request #95 from mneorr/tab-selection

Tab selection
turned back the higher toolbar
disable focus on tab buttons
use bleeding edge kiwi, added some tests
Do not build target Alcatraz-Test when running (only when testing)