Initial plenv plugin creation

plugins/available/plenv.plugin.bash

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+# Installs plenv and perl-build if not installed
+
+cite about-plugin
+about-plugin 'Perl plenv plugin'
+
+pathmunge "${HOME}/.plenv/bin"
+
+[[ `which plenv` ]] && eval "$(plenv init -)"
+
+# What an incredible smell you've discovered!
+
+# detect bash
+[[ $BASH ]] && SHELL_NAME='bash'
+
+# detect csh/tcsh
+
+# detect zsh
+[[ $ZSH_NAME ]] && SHELL_NAME='zsh'
+
+# detect fish
+
+# Load the auto-completion script if plenv is installed.
+[[ -e ~/.plenv/completions/plenv.${SHELL_NAME} ]] && source ~/.plenv/completions/plenv.${SHELL_NAME}