Merge pull request #154 from phi-gamma/master

fixes, mainly to diagnostics
Merge pull request #155 from phi-gamma/master

sync with Context
Merge pull request #157 from phi-gamma/master

[fontloader] sync with Context as of 2013-12-25
Merge pull request #158 from phi-gamma/master

Xetex compatibility for letterspacing
Merge pull request #159 from phi-gamma/master

make fontwise letterspacing an official supported feature
[doc,main] update version date in dtx
trancyparency conflicts with other packages
transparency conflicts with other packages
Merge branch 'master' of https://github.com/dohyunkim/luaotfload
use table instead of string for transparency
reduce the size of res table
Merge pull request #160 from dohyunkim/master

transparency conflicts with other packages
[tool] rephrase help message
Merge branch 'master' of github:lualatex/luaotfload