Integrate changelog entries from base-4.7.0.1 rel
Remove unused parameter in rnHsTyVar
Comments only
Declare official github home of libraries/unix

Effective immediately, pushing to libraries/unix requires pushing to
ssh://git@github.com/haskell/unix.git. This done now even though there's
no scripted tooling yet as the GitHub repo is already receiving pull requests
(which are getting merged)
Add travis script

in contrast to ghc-complete, which uses a custom script, let's try to
use "validate --fast" here, and maybe evolve into a "validate --fastest"
mode.
Fix submodule paths
Build less verbosely
Pass -DDEBUG when requested
Do not build dynamic libraries
Skip building haddock and docs
Fix syntax
no --no-clean
Skip performance tests
Try with 3 cpus