[pathmunge] remove duplicate entry into PATH variable on reload command

plugins/available/latex.plugin.bash

@@ -4,6 +4,6 @@ about-plugin 'use mactex'
 # add mactex to the path if its present
 MACTEX_PATH=/usr/local/texlive/2009/bin/universal-darwin
 if [[ -d  $MACTEX_PATH ]]; then
-    export PATH=$PATH:$MACTEX_PATH
+  pathmunge $MACTEX_PATH after
 fi
 unset MACTEX_PATH

plugins/available/pipsi.plugin.bash

@@ -3,5 +3,5 @@ about-plugin 'load pipsi, if you are using it'
 
 if [[ -f "$HOME/.local/bin/pipsi" ]]
 then
-    export PATH=~/.local/bin:$PATH
+    pathmunge ~/.local/bin
 fi

plugins/available/pyenv.plugin.bash

@@ -2,7 +2,8 @@ cite about-plugin
 about-plugin 'load pyenv, if you are using it'
 
 export PYENV_ROOT="$HOME/.pyenv"
-export PATH="$PYENV_ROOT/bin:$PATH"
+pathmunge $PYENV_ROOT
+
 [[ `which pyenv` ]] && eval "$(pyenv init -)"
 
 #Load pyenv virtualenv if the virtualenv plugin is installed.

plugins/available/rbenv.plugin.bash

@@ -3,7 +3,8 @@
 cite about-plugin
 about-plugin 'load rbenv, if you are using it'
 
-export PATH="$HOME/.rbenv/bin:$PATH"
+pathmunge "${HOME}/.rbenv/bin"
+
 [[ `which rbenv` ]] && eval "$(rbenv init -)"
 
 # Load the auto-completion script if rbenv was loaded.

plugins/available/ruby.plugin.bash

@@ -4,7 +4,7 @@ about-plugin 'ruby and rubygems specific functions and settings'
 # Make commands installed with 'gem install --user-install' available
 # ~/.gem/ruby/${RUBY_VERSION}/bin/
 if which ruby >/dev/null && which gem >/dev/null; then
-  PATH="$PATH:$(ruby -e 'print Gem.user_dir')/bin";
+  pathmunge "$(ruby -e 'print Gem.user_dir')/bin" after
 fi
 
 function remove_gem {

plugins/available/todo.plugin.bash

@@ -15,6 +15,7 @@ fi
 # respect ENV var set in .bash_profile, default is 't'
 alias $TODO='$TODO_SRC_DIR/todo.sh -d $TODO_SRC_DIR/todo.cfg'
 
-export PATH=$PATH:$TODO_SRC_DIR
+pathmunge $TODO_SRC_DIR after
+
 source $TODO_SRC_DIR/todo_completion   # bash completion for todo.sh
 complete -F _todo $TODO                # enable completion for 't' alias