Merge pull request #18 from davidmaack/master

Importer now uses Geocoding V3 API
Replaced own country names with translations from core (see #9)
Importer is now using File Class (see #15)
Using Request class instead of file_get_contents (see #14)

Every class now uses a static method from StoreLocator class for
retrieving coordinates
Templating for InsertTags (see #16)

Now using a template for the insert tag rendering, also removed support
for outdated *.tpl templates
Code cleanups
Updated Readme
used markdown for readme
readme wasnt shown with correct md on github
small bugfixes and improvements
Added fallback if request on main Geo API fails

- A second Geo API is used if the first one blocked the client
- Backend listing is now showing icon wether coordinates are given or
not