lineSpacing treatment upgrade

kCTParagraphStyleSpecifierLineSpacing
Deprecated. Use kCTParagraphStyleSpecifierMaximumLineSpacing,
kCTParagraphStyleSpecifierMinimumLineSpacing, and
kCTParagraphStyleSpecifierLineSpaceAdjustment to control space between
lines.
https://developer.apple.com/library/mac/documentation/Carbon/reference/C
TParagraphStyleRef/Reference/reference.html#jumpTo_35
Merge pull request #181 from qchenqizhi/master

Fixed usage of deprecated keys for ParagraphStyle LineSpacing (#181)