automatically update errors when enabling/disabling syntax checkers
automatically update errors when enabling/disabling syntax checkers

If a user uses :SyntasticEnable or :SyntasticDisable, update the errors
for the buffer automatically if possible

wezhang/vim-setup,wezhang/vim-setup,wezhang/vim-setup,wezhang/vim-setup,wezhang/vim-setup,nikmartin/dotfiles,wezhang/vim-setup