Fix/acl check#24

[jaxoncreed]

Fix for nodeSolidServer/acl-check#24

[michielbdejong]

This PR is just about the third commit, right?

[michielbdejong]

approving the third commit, e35bb76.

[michielbdejong]

rebased this branch so that it's just that commit on top of master. let's merge this asap even if #1241 takes longer.

[michielbdejong]

tests are failing

1) Header handler
       WAC-Allow
         a resource that is read/write/append/control for the user, nothing for the public
           "before all" hook:
     Error: Timeout of 10000ms exceeded. For async tests and hooks, ensure "done()" is called; if returning a Promise, ensure it resolves. (/home/travis/build/solid/node-solid-server/test/integration/header-test.js)

[michielbdejong]

Hah, that's nice:

$ npm audit
                                                                                
                       === npm audit security report ===                        
                                                                                
found 0 vulnerabilities
 in 71944 scanned packages