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Fixes weird bug when completing.

Co-authored-by: Matsievskiy S.V <matsievskiysv@gmail.com>
Co-authored-by: Marc Cornellà <marc.cornella@live.com>

Changes themes displaying RVM or other Ruby version info to use the central
ruby_prompt_info function. This supports more Ruby versioning mechanisms,
reduces copy-and-paste code, and avoids "zsh: no such file or directory: rvm-prompt"
when run on machines that do not have RVM installed.

Changes the prefix/suffix variable names to ZSH_THEME_RUBY_PROMPT_PREFIX and
ZSH_THEME_RUBY_PROMPT_SUFFIX, since they apply to all Ruby versioning mechanisms,
not just RVM.

Allows empty ZSH_THEME_RUBY_PROMPT_PREFIX and ZSH_THEME_RUBY_PROMPT_SUFFIX.

These themes used an adhoc substitution of $HOME for tilde
in $PWD, but it's better to use '%~' and is less error prone.

See #7160

* theme/fino: Check rvm-prompt is installed before to try to use it
Signed-off-by: Nick Diego Yamane <nick.diego@gmail.com>

* theme/fino-time: Check rvm-prompt is installed before to try to use it
Signed-off-by: Nick Diego Yamane <nick.diego@gmail.com>

also fix bug where prompt char did not reflect
whether or not you were in a git repo.

Add my brand new oh-my-zsh theme called Fino. It borrows from some other
themes (see comments at the beginning). I only have/can tested on OS X
10.7, so there might be some compatibility problems with other
platforms.