Modernize Objective-C code and enhance Swift compatibility#6

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gskbyte wants to merge 7 commits intolivehelpnow:masterfrom

xing:modernize_objc

Commits on Feb 22, 2016

Add nullability specifiers
Jose Alcalá Correa
committed
Set type of timeIntervals to NSTimeInterval
Jose Alcalá Correa
committed
Uncrustify all files
Jose Alcalá Correa
committed
Uncrustify all files
Jose Alcalá Correa
committed
Revert "Uncrustify all files"
Jose Alcalá Correa
committed
Add strong property modifiers, rename ms parameters to timeInterval
Jose Alcalá Correa
committed
Remove unneeded strong modifiers
Jose Alcalá Correa
committed