Update runtime files.

runtime/syntax/dockerfile.vim

@@ -0,0 +1,24 @@
+" dockerfile.vim - Syntax highlighting for Dockerfiles
+" Maintainer:   Honza Pokorny <http://honza.ca>
+" Version:      0.5
+" Last Change:  2014 Aug 29
+" License:      BSD
+
+
+if exists("b:current_syntax")
+    finish
+endif
+
+let b:current_syntax = "dockerfile"
+
+syntax case ignore
+
+syntax match dockerfileKeyword /\v^\s*(ONBUILD\s+)?(ADD|CMD|ENTRYPOINT|ENV|EXPOSE|FROM|MAINTAINER|RUN|USER|VOLUME|WORKDIR|COPY)\s/
+
+syntax region dockerfileString start=/\v"/ skip=/\v\\./ end=/\v"/
+
+syntax match dockerfileComment "\v^\s*#.*$"
+
+hi def link dockerfileString String
+hi def link dockerfileKeyword Keyword
+hi def link dockerfileComment Comment