`referenceSystem` breaks when it starts with `http://` instead of `https://`

[liberostelios]

Currently, we use a regular expression to parse the referenceSystem, but it only expects a url that starts with https. This breaks the loading of the file. Two things should be fixed:

1. The property should be allowed to have an http:// url, and
2. If this line breaks, an exception trap should be use to allow the user to continue.