Compile git revision info into Haskell projects; documentation

 This library provides some handy Template Haskell splices for including the
 current git hash and branch in the code of your project. Useful for including
 in panic messages, --version output, or diagnostic info for more informative
 bug reports.
 .
 This package provides the documentation for a library for the Haskell
 programming language.
 See http://www.haskell.org/ for more information on Haskell.