remove bad quote from lambda arg to mapcar

  Thanks to jumpcannon for pointing this out.
remove `inf-ruby-keys' (which has been renamed)

According to https://github.com/technomancy/emacs-starter-kit/pull/145
this can just be removed, as the function should already be called if
inf-ruby is available.
adding the melpa package repository

This change was suggested by ViktorHaag on github.
perhaps this does it?
corrected yasnippet startup
Finish feature-replace-yasnippet-bundle
replaced yasnippet-bundle with yasnippet
fix bug installing yasnippet over yasnippet-bundle

  Without this check the new yasnippet install throws errors if the old
  yasnippet-bundle has not been deleted.  Better to add two lines to
  starter-kit.org than have every user run into this problem on their
  next update.
.
Merge remote-tracking branch 'upstream/master'