peace out, sublime (closes #150)
Skip symlink if the existing symlink links to the same destination
Merge pull request #154 from sibartlett/skip-symlink

Skip symlink - if the existing symlink links to the same destination
--no-ri --no-rdoc is deprecated, use --no-document

/ruby/gemrc.symlink :
this congifuration was using 'gem: --no-ri --no-rdoc' to avoid
installation of docs with gems, but this method is now deprecated
changed it to new official way => 'gem: --no-document'
Merge pull request #157 from pravj/update-gemrc

--no-ri --no-rdoc is deprecated, use --no-document
Merge remote-tracking branch 'upstream/master'