update fino theme to work with rbenv

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

themes/fino.zsh-theme

 # Fino theme by Max Masnick (http://max.masnick.me)
 
 # Use with a dark background and 256-color terminal!
-# Meant for people with RVM and git. Tested only on OS X 10.7.
+# Meant for people with rbenv and git. Tested only on OS X 10.7.
 
 # You can set your computer name in the ~/.box-name file if you want.
 
@@ -11,12 +11,9 @@
 #
 # Also borrowing from http://stevelosh.com/blog/2010/02/my-extravagant-zsh-prompt/
 
-function virtualenv_info {
-    [ $VIRTUAL_ENV ] && echo '('`basename $VIRTUAL_ENV`') '
-}
 
 function prompt_char {
-    git branch >/dev/null 2>/dev/null && echo '±' && return
+  git branch >/dev/null 2>/dev/null && echo "±" && return
   echo '○'
 }
 
@@ -24,14 +21,14 @@ function box_name {
     [ -f ~/.box-name ] && cat ~/.box-name || hostname -s
 }
 
-
-local rvm_ruby='‹$(rvm-prompt i v g)›%{$reset_color%}'
 local current_dir='${PWD/#$HOME/~}'
 local git_info='$(git_prompt_info)'
+local prompt_char='$(prompt_char)'
+local rbenv_version='$(rbenv version-name)'
 
 
-PROMPT="╭─%{$FG[040]%}%n%{$reset_color%} %{$FG[239]%}at%{$reset_color%} %{$FG[033]%}$(box_name)%{$reset_color%} %{$FG[239]%}in%{$reset_color%} %{$terminfo[bold]$FG[226]%}${current_dir}%{$reset_color%}${git_info} %{$FG[239]%}using%{$FG[243]%} ${rvm_ruby}
-╰─$(virtualenv_info)$(prompt_char) "
+PROMPT="╭─%{$FG[040]%}%n%{$reset_color%} %{$FG[239]%}at%{$reset_color%} %{$FG[033]%}$(box_name)%{$reset_color%} %{$FG[239]%}in%{$reset_color%} %{$terminfo[bold]$FG[226]%}${current_dir}%{$reset_color%}${git_info} %{$FG[239]%}using%{$FG[243]%} ‹${rbenv_version}›%{$reset_color%}
+╰─${prompt_char} "
 
 ZSH_THEME_GIT_PROMPT_PREFIX=" %{$FG[239]%}on%{$reset_color%} %{$fg[255]%}"
 ZSH_THEME_GIT_PROMPT_SUFFIX="%{$reset_color%}"