* Improve darwin and cygwin build, seperate installable libparrot.
  GH #1212, 1096
* Honor --disable-rpath on darwin, skip -install_name then
* Update default cygwin compiler and linker to gcc with 1.7
* Add darwin and windows smokers (travis + appveyor), prev. linux only
* use a smaller default target: core (most parrot_utils, not all)
  make all builds now all, including docs and installables