Merge branch 'master' into gcc_refactor

autoload/syntastic/c.vim

@@ -277,7 +277,8 @@ endfunction
 function! syntastic#c#CheckRuby()
     if executable('ruby')
         if !has_key(s:cflags, 'ruby')
-            let s:cflags['ruby'] = system('ruby -r rbconfig -e ''puts Config::CONFIG["archdir"]''')
+            let s:cflags['ruby'] = system('ruby -r rbconfig -e ' .
+                \ '''puts RbConfig::CONFIG["rubyhdrdir"] || RbConfig::CONFIG["archdir"]''')
             let s:cflags['ruby'] = substitute(s:cflags['ruby'], "\n", '', '')
             let s:cflags['ruby'] = ' -I' . s:cflags['ruby']
         endif

doc/syntastic.txt

@@ -153,6 +153,10 @@ current filetype is set to passive. See |'syntastic_mode_map'| for more info.
 Output info about what checkers are available and in use for the current
 filetype.
 
+:SyntasticReset                                              *:SyntasticReset*
+
+Resets the list of errors and turns off all error notifiers.
+
 
 ==============================================================================
 4. Global Options                                   *syntastic-global-options*

plugin/syntastic.vim

@@ -78,6 +78,7 @@ command! SyntasticToggleMode call s:ToggleMode()
 command! -nargs=? -complete=custom,s:CompleteCheckerName SyntasticCheck call s:UpdateErrors(0, <f-args>) <bar> call s:Redraw()
 command! Errors call s:ShowLocList()
 command! SyntasticInfo call s:registry.echoInfoFor(s:CurrentFiletypes())
+command! SyntasticReset call s:ClearCache() | call s:notifiers.refresh(g:SyntasticLoclist.New([]))
 
 highlight link SyntasticError SpellBad
 highlight link SyntasticWarning SpellCap