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.