Contrib: vim syntax, update core module directives.

syn keyword ngxDirectiveImportant contained include

syn keyword ngxDirectiveImportant contained root

"syn keyword ngxDirectiveImportant contained server

syn keyword ngxDirectiveImportant contained server_name

"syn keyword ngxDirectiveImportant contained listen

syn keyword ngxDirectiveImportant contained internal

syn keyword ngxDirectiveImportant contained proxy_pass

syn keyword ngxDirectiveImportant contained memcached_pass

syn keyword ngxDirective contained autoindex_format

syn keyword ngxDirective contained autoindex_localtime

syn keyword ngxDirective contained charset

syn keyword ngxDirective contained charset_map

syn keyword ngxDirective contained charset_types

syn keyword ngxDirective contained chunked_transfer_encoding

syn keyword ngxDirective contained client_body_buffer_size

syn keyword ngxDirective contained resolver

syn keyword ngxDirective contained resolver_timeout

syn keyword ngxDirective contained rewrite_log

syn keyword ngxDirective contained rtsig_overflow_events

syn keyword ngxDirective contained rtsig_overflow_test

syn keyword ngxDirective contained rtsig_overflow_threshold

syn keyword ngxDirective contained rtsig_signo

syn keyword ngxDirective contained satisfy

syn keyword ngxDirective contained scgi_bind

syn keyword ngxDirective contained scgi_buffer_size

syn keyword ngxDirective contained tcp_nodelay

syn keyword ngxDirective contained tcp_nopush

syn keyword ngxDirective contained thread_pool

syn keyword ngxDirective contained thread_stack_size

syn keyword ngxDirective contained timeout

syn keyword ngxDirective contained timer_resolution

syn keyword ngxDirective contained types_hash_bucket_size

syn keyword ngxDirective contained uwsgi_next_upstream_tries

syn keyword ngxDirective contained uwsgi_no_cache

syn keyword ngxDirective contained uwsgi_param

syn keyword ngxDirective contained uwsgi_pass

syn keyword ngxDirective contained uwsgi_pass_header

syn keyword ngxDirective contained uwsgi_pass_request_body

syn keyword ngxDirective contained uwsgi_pass_request_headers

syn keyword ngxDirective contained worker_processes

syn keyword ngxDirective contained worker_rlimit_core

syn keyword ngxDirective contained worker_rlimit_nofile

syn keyword ngxDirective contained worker_rlimit_sigpending

syn keyword ngxDirective contained worker_shutdown_timeout

syn keyword ngxDirective contained worker_threads

syn keyword ngxDirective contained working_directory

syn keyword ngxDirective contained xclient

syn keyword ngxDirective contained xml_entities