Modified Zsh prompt so that it shows git and venv state.
1. Disabled live zsh prompt clock due to a strange bug that
   clears the parser state contents of PS2='%_>' every tick of TMOUT.
2. Modified .vimrc so that enable commands are executed with an autocommand after
   all the plugins could be presumed to be loaded.
1. Added gpg-agent support in xinitrc.
2. Added project home variable export for python virtualenv in
   zshrc.
1. Expanded conky configuration to show a few more performance
   meters.
2. Added an export EDITOR statement in zshrc.
1.  Moved the startup commands to i3 config.
2.  Set gpg-agent start-up in xinitrc.