JSCS checker: add "--max-errors -1" option.

Limiting the number of errors causes an error message to be printed to
stderr, which in turn breaks JSON parsing.

plugin/syntastic.vim

@@ -19,7 +19,7 @@ if has('reltime')
     lockvar! g:_SYNTASTIC_START
 endif
 
-let g:_SYNTASTIC_VERSION = '3.7.0-79'
+let g:_SYNTASTIC_VERSION = '3.7.0-80'
 lockvar g:_SYNTASTIC_VERSION
 
 " Sanity checks {{{1

syntax_checkers/javascript/jscs.vim

@@ -29,7 +29,8 @@ function! SyntaxCheckers_javascript_jscs_IsAvailable() dict
 endfunction
 
 function! SyntaxCheckers_javascript_jscs_GetLocList() dict
-    let makeprg = self.makeprgBuild({ 'args_after': '--no-colors --reporter json' })
+    let makeprg = self.makeprgBuild({
+        \ 'args_after': '--no-colors --max-errors -1 --reporter json' })
 
     let errorformat = '%f:%l:%c:%m'