Merge pull request #1767 from dandoveralba/instruments

Instruments Launch Failures
if we can't find ios logs, just log error, don't crash appium
add some logging around real device methods
make settings app a first-class appium-supported ios app
enable basic prefs tests to pass on ios7 sim
@sebv this will probably cause merge conflicts, I tried to make it easy
to see what's going on here
Test reformatting, step2.