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Autocompletion fails if there's only one mark, since the ls command
will not display the parent directory with the trailing colon.
Handling the single mark case separately and validating the symlink
explicitly, resolves the issue.

Change marks function and remove 'function' keyword as suggested by pielgrzym in https://github.com/robbyrussell/oh-my-zsh/pull/2045#issuecomment-22820224

Add _completemarks function as suggested by pielgrzym in https://github.com/robbyrussell/oh-my-zsh/pull/2045#issuecomment-22826540

Copy and paste of two functions from Ubuntu 13.04's version of /usr/share/zsh/functions/Completion/Unix/_git that were referenced in 46f0d8db. Fixes #1952.

pod-lib removed. whyever I described it...

* the current patch levels hard-coded here are pretty dated. I updated the ruby version helpers to use loose ruby version matchers so they don't continually need to be updated with every new patch level release.

* `rvm get head` actually performs an `rvm reload` in the post install. there's no need to do again here in rvm-update so I've removed that.

+ Originally published by Christopher Chow.
+ Source:
https://github.com/robbyrussell/oh-my-zsh/blob/30620d463850c17f86e7a56fbf6a8b5e793a4e07/plugins/rails3/_rails3
  Commit: 30620d463850c17f86e7a56fbf6a8b5e793a4e07