erc: added carp checker; vimrc: added carp checker and vim-es6

vimrc

@@ -93,6 +93,7 @@ Bundle 'hellerve/luna-vim'
 Bundle 'tikhomirov/vim-glsl'
 Plugin 'rust-lang/rust.vim'
 Plugin 'kchmck/vim-coffee-script'
+Plugin 'isRuslan/vim-es6'
 
 " Custom bundles
 if filereadable(expand("~/.vim.local/bundles.vim"))
@@ -636,3 +637,5 @@ if filereadable(expand("~/.vimrc.local"))
 endif
 
 " }}}
+
+let g:syntastic_carp_checkers = ['carp']