Drop g:syntastic_perl_perlcritic_options.

This variable has been rendered obsolete by the standard mechanism
of g:syntastic_perl_perlcritic_args.
Modeline for help.
Update syntax_checkers/dart/dart_analyzer.vim
Don't pass -fno-code to ghc
Change the endif on SyntaxCheckers_objc_gcc_IsAvailable to endfunction
Merge pull request #509 from lcd047/master

Drop g:syntastic_perl_perlcritic_options.
lisp/clisp: add a missing comma
add guards to all checkers

goddamn I love macros
Merge pull request #517 from trprice/master

Fix the "Missing :endfunction" in syntax_checkers\objc\gcc.vim
Merge pull request #516 from mybuddymichael/master

Don't pass -fno-code to Haskell's ghc
Merge pull request #514 from dominic-goog/master

fix 'missing endfunction' error for dart
be more strict with default checker settings

If a filetype has default checker settings, then only allow those
checkers to be used by default. The user must manually specify other
checkers to use if they dont want the default.

In future the `s:defaultCheckers` hash should be more complex (or
possibly an object) that allows us to specify "only" vs "preferred".

This change was made in response to the html filetype using the w3
checker when tidy is not installed.