Fix: zero pages in bundle book caused an infinite "init book" loop

Added macro to check if iOS version is >= 5.0 at both compile and run…

…ning time + fix spinner setColor on older iOS versions (spinners color set to gray). Closes Simbul#182

Readme fixes for Baker 3.0 release (Simbul review).

README: added "Added support to enable automatic media playback"

Updated changelog 1.1.

Updated readme.