Reflowable Layout

New function “setGlobalOffset” is added.
-(void)setGlobalOffset:(BOOL)isGlobalOffset;

// when this value is true, all offsets of highlights will be calculated and sent
// based on the character offset of text in chapter rather than the offset of each element.
// the startIndex and endIndex of highlight will be set to 0 (zero)
[rv setGlobalOffset:YES];

SkyProvider
Performance Enhanced.
becomes more fault-tolerant.
displays case-sensitive exception message.