add support for zsh

Author: ap

after/syntax/zsh.vim

@@ -0,0 +1,4 @@
+syn match zshCommentColor contained '\(#[^#]*\)\@<=\zs#\x\{3}\%(\x\{3}\)\?\>' containedin=zshComment
+call css_color#init( 'hex', 'none'
+	\, 'zshString,zshPOSIXString,zshHereDoc,'
+	\. 'zshCommentColor' )

tests/example.zsh

@@ -0,0 +1,23 @@
+# XXX  #0f0 should show up green
+# XXX   f00 should not show up red
+# FIXME ff0 should show up yellow but are known not to
+
+echo '#0f0'
+echo ##0f0
+echo \#ff0
+echo #f00
+echo ##0f0
+echo # #0f0
+cmd '#0f0'
+cmd "#0f0"
+cmd \#ff0
+cmd #f00
+cmd ##0f0
+cmd # #0f0
+#f00
+##0f0 XXX
+# #0f0 XXX
+# XXX #0f0 XXX
+cat << ''
+#0f0
+