Helped extra-ghci-libraries find its way to .cabal files.
clean redunant imports in cabal-install\Distribution\Client: Environment.hs, Time.hs
remove #if MIN_VERSION_base(4,5,0)
Merge pull request #2127 from Heather/iclean

Remove redundant imports in cabal-install\Distribution\Client\
Merge pull request #1859 from anton-dessiatov/master

Add extra-ghci-libraries support to .cabal files
Document building cabal from git sources and running the tests.
Merge pull request #2140 from erikd/master

Document building cabal from git sources and running the tests.
Whitespace.
Improve 'BuildingFromGit.md' a little bit.
Merge 'BuildingFromGit.md' and 'HACKING.md'.
bootstrap.sh: alter check for tarballs already downloaded to work with symlinks also
support bootstrapping cabal-install into a sandbox