give the caller the option to handle the exception

Corrected simple typo

We can't do the loading before matching the route, because some routes
need to do the loading after matching of the route. For example the
navigation detection of the app settings page.

Added contextual comments

prettier error output. Let´s see how many more low hanging fruits I find on my way to the real bug that I want to fix ;-)

make it possible to manually override the hostname and protocol if the automatic detection from ownCloud fails. This can happen in reverse proxy situations or with loadbalancers setups.

fixes #234