Updated .gitignore and README.md.

Added GnuPG key information to README.md.
Added various dotfiles.

* Xresources
* profile, xprofile, xinitrc
* bash (aliases, logout, profile, rc, completion)
* gitconfig
* gtkrc and gtk-bookmarks
* i3 configs (with py3status configs)
* i3status.conf
* lftp/rc
* tmux.conf
* xbindkeysrc
* mpdconf
* ncmpcpp (config and keys)
* sbclrc
* vifm (vifmrc, colors)
* urxvt (perl extensions)
* conkyrc (and conky/cronograph configs)