Amix/vimrc structure on nonplugin related settings

Mayor changes:
 * I prefer using the system clipboard instead of named registers.
 * I prefer <C-{hjkl}> keys for moving between windows, and <S-{zx}> keys for
   moving between tabs.
 * Escape key delay workaround.
 * Deleting trailing whitespaces before save in all filetypes (Not just .py)
   and restoring last position when opening files.
Sync plugins with my current vimrc

Mayor changes:
 * pyflakes -> syntastic
 * git-vim -> fugitive
 * vim-autoclose -> delimitMate
 * snipmate -> ultisnips
 * autocompltpop -> neocomplcache
 * Other plugins: gitv, vim-multiple-cursors
 * I prefer vim-hybrid colorscheme
More mappings

 * ,q for fast quiting
 * <C-z> as insert key in insert and replace mode
New plugin: vim-tmux-navigator
Force 256 colors support on terminals.
Merge branch 'curita-version'
Remove unneeded files.