Gitignore file has been improved.

'xccheckout' and several other entries have been added.
64bit support has been implemented.
64bit support has been improved with 'tgmath.h' header.
Merge pull request #180 from maximkhatskevich/master

64bit support and improved Gitignore file.
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
Deprecating the library in favor of DTCoreText, as I don't have time to maintain it anymore.
Merge pull request #181 from qchenqizhi/master

Fixed usage of deprecated keys for ParagraphStyle LineSpacing (#181)
Merge remote-tracking branch 'upstream/master'
Merge pull request #1 from MindaugasV/update_from_upstream

Update from upstream