window.location calls it reload so util/helpers shouldn't call it
redirect because UI/util/UIUtil has it is own redirect which is the
assign of window.location.

Converts ConferenceUrl to a class and binds an instance to the global
APP variable, as requested by HTerezov.

We need to make sure that on the page reload all original parameters
used to load the conference are preserved. New modules helps to manage
different types of conference URLs like the one used for invites and
the one for reloading the page.