add configuration parameter for .zsh_history

* history didn't get saved with Ubuntu / Lubuntu 13.10
* fix by adding HISTFILE and SAVEHIST parameter to .zshrc
remove empty, not used directory

* vim-ruby is not declared bei vundle, therefore
* ":BundleClean" suggested to removed empty directory
introduce solarized colors to Xfce-terminal

* vim solarized theme did not look good
* needed to change terminal colors