Include nvm if installed and did cleanup

• Add nvm if included
 • Add bash complete for nvm
 • Remove virtualenvwrapper because I don't use it
 • Remove dupe PATH
 • Remove unused from PATH

bash/environment

@@ -48,11 +48,9 @@ _add-path /usr/local/mysql/bin
 _add-path /opt/vertica/bin
 _add-path /opt/local/bin
 _add-path /opt/local/sbin
-_add-path /opt/bin
 _add-path ~/bin
 _add-path /usr/local/go/bin
 _add-path ~/.bin
-_add-path $HOME/Library/Haskell/bin
 
 if [[ $(uname) == 'Darwin' ]]; then
     export BS_OS='osx'
@@ -62,8 +60,5 @@ fi
 
 export EDITOR='vim'
 
-# python virtualenvwrapper
-export WORKON_HOME="$HOME/.virtualenvs"
-if [ -f /usr/local/bin/virtualenvwrapper.sh ]; then
-    source /usr/local/bin/virtualenvwrapper.sh
-fi
+[[ -f ~/.nvm/nvm.sh ]] && source ~/.nvm/nvm.sh
+[[ -r $NVM_DIR/bash_completion ]] && source $NVM_DIR/bash_completion