Address security issues in loofah and rack
Address security issues in loofah and rack

The following CVE are solved in this commit:

* CVE-2018-16471
* CVE-2018-16470
* CVE-2018-16468

ausaccessfed/saml-service,ausaccessfed/saml-service,ausaccessfed/saml-service,ausaccessfed/saml-service