Fixup string interpolation for integers

Same as Xcode auto-fix, but without the explicit
casting (implicit).
Tweak code style for unchanged-value setter guarding
Fixup 7fa9fb1: optimize CocoaPods gem install
Split up sample app env config groups into separate info files

Also update local client info.
Fixup warning-worthy implicit conversion of %lu to %d
Merge branch 'master' into peng/add-accounts-widget

Conflicts:
	NBClientExample/NBClientExample.xcodeproj/project.pbxproj