Fix PEP8 issues with .ycm_extra_conf.py
Fix problem with AutoComplPop’s popup-menu (space now closes it properly)
Configured syntastic to use flake8 for python syntax checking
Updated ~/.vimrc with more plugins and settings

- Updated powerline plugin.
- Added lightline.vim, html5.vim, vim-coffee-script, 
vim-css3-syntax, elzr/vim-json.
- Configured Yggdroot/indentLine
- Configured clang_complete and neocomplete
- Loaded syntactic together with clang_complete