Vim Plugin (vim-flake8) - python static analysis tool

1. Install pathogen.vim
------------------------
  - mkdir -p ~/.vim/autoload
  - curl -LSso ~/.vim/autoload/pathogen.vim https://tpo.pe/pathogen.vim

2. Add runtime path manipulation
---------------------------------
Write the following in ~/.vimrc
  execute pathogen#infect()
  syntax on
  filetype plugin indent on
  " Disable auto indent in local file by pressing F8
  :nnoremap <F8> :setl noai nocin nosi inde=<CR>
  
3. Add the vim-flake8 plugin to vim:
------------------------------------
  - git clone git@github.com:nvie/vim-flake8.git ~/.vim/bundle/vim-flake8
  
4. Create python Virtual Env(Optional):
---------------------------------------
Most of the development machines will not grant root permission to install python packages, So better to 
create a virtualenv to install our experimental python pacakges

  - cd /home/<user>/
  - virtualenv devenv

5. Install flake8 in the devenv:
--------------------------------
  - source /home/<user>/devenv/bin/activate
  - sudo pip install flake8
  
6. Automatic PEP8 check on saving a file:
------------------------------------------
6.1 Write the following in ~/.bashrc
   source /home/<user>/devenv/bin/activate
6.2 Write the following in ~/.vimrc
   autocmd BufWritePost *.py call Flake8()
  
NOTE: If auto PEP8 check is not prefered skip step 6.2, Instead press F7 to check