* master:
  correct typo
  add functional spec for http downloader
  refactor: raise a UnsupportedFileTypeError when unexpected file type is given
  cleanup http downloader, add spec
  load yaml only when needed
  add http downloader - that download repo with http and then decompress them
  Travis build status only for master branch
  Small cleanup.
  Removed broken Xcodeproj bundle install command from rake bootstrap task