Add graphql support, closes #298

ftplugin/graphql.vim

@@ -0,0 +1,22 @@
+if exists('g:polyglot_disabled') && index(g:polyglot_disabled, 'graphql') != -1
+  finish
+endif
+
+" Vim filetype plugin
+" Language: GraphQL
+" Maintainer: Jon Parise <jon@indelible.org>
+
+if (exists('b:did_ftplugin'))
+  finish
+endif
+let b:did_ftplugin = 1
+
+setlocal comments=:#
+setlocal commentstring=#\ %s
+setlocal formatoptions-=t
+setlocal iskeyword+=$,@-@
+setlocal softtabstop=2
+setlocal shiftwidth=2
+setlocal expandtab
+
+let b:undo_ftplugin = 'setlocal com< cms< fo< isk< sts< sw< et<'