NIGHTLY: checkin
Add language/location sense.

This will return a client.json file based on user preference.
It will work from most preferred to least, to "en" as the default.
It also presumes all pathnames are in lower case (because LCD)
Adding stub because otherwise nothing will work
r?s

* Broke LangPath to own structure
** moved path checks to LangPath
* modified tests for new struct
remove redundant cast
Merge branch 'feature/langloc' into tests

Conflicts:
	wmf/handlers_test.go