add yaml syntax checker

doc/syntastic.txt

@@ -347,6 +347,10 @@ The latest dev versions are on github
 ==============================================================================
 7. Changelog                                             *syntastic-changelog*
 
+next
+    - Support for new filetypes:
+        - yaml
+
 2.2.0
     - only do syntax checks when files are saved (not when first opened) - add
       g:syntastic_check_on_open option to get the old behavior back

syntax_checkers/yaml.vim

@@ -0,0 +1,31 @@
+"============================================================================
+"File:        yaml.vim
+"Description: Syntax checking plugin for syntastic.vim
+"Maintainer:  Martin Grenfell <martin.grenfell at gmail dot com>
+"License:     This program is free software. It comes without any warranty,
+"             to the extent permitted by applicable law. You can redistribute
+"             it and/or modify it under the terms of the Do What The Fuck You
+"             Want To Public License, Version 2, as published by Sam Hocevar.
+"             See http://sam.zoy.org/wtfpl/COPYING for more details.
+"
+"
+"Installation: $ npm install -g js-yaml js-yaml.bin
+"
+"============================================================================
+if exists("loaded_yaml_syntax_checker")
+    finish
+endif
+let loaded_yaml_syntax_checker = 1
+
+if !executable("js-yaml")
+    finish
+endif
+
+function! SyntaxCheckers_yaml_GetLocList()
+    let makeprg='jsyaml --compact ' . shellescape(expand('%'))
+    let makeprg='js-yaml --compact ' . shellescape(expand('%'))
+    let errorformat='Error on line %l\, col %c:%m,%-G%.%#'
+    return SyntasticMake({ 'makeprg': makeprg,
+                         \ 'errorformat': errorformat,
+                         \ 'defaults': {'bufnr': bufnr("")} })
+endfunction