Better colour for zsh prompt
Making the vim plugins as git submodules

  - Previously the vim bundle plugins were not git submodules, making them
    submodules makes it easy to manage them.
  - Add calender.vim as the submodule.
Overhauling my environ

  - Moving to new package manager for vim NeoBundle
  - Change in some settings of my environ
  - Add install script to setup environ