This will allow neosnippet's enable_completed_snippet function to work
correctly. I also removed reading g:tern_show_signature_in_pum because
it didn't make much sense to use the opposite default of tern-for-vim.
We might as well not listen to it at all. I can't see much reason for
disabling the function signature anyway, but if we do, we should use our
own option since we want it enabled by default.
This will allow neosnippet's enable_completed_snippet function to work correctly. I also removed reading g:tern_show_signature_in_pum because it didn't make much sense to use the opposite default of tern-for-vim. We might as well not listen to it at all. I can't see much reason for disabling the function signature anyway, but if we do, we should use our own option since we want it enabled by default.