Merge branch 'release-1.6.0.1' into develop
Introduces ProviderBase for Markers.

Moves all provider's files to Providers namespace to get better separation and cleaner interface.
Repairs multicity chargers not displayed in WP8.

dbrent seems to deliver crappy json. The WP8-libraries are a little bit stricter than the former ones used in WP7. So they fail to encode the json-file to objects.

We replace some characters known to cause problems to solve the issue. Hopefully this will be of longer use.
Code cleanup
Adds a booking-browser for multicity.
Prepares multicity-booking workflow.

Adds browser for the multicity-booking and some notification-message strings
Adds username and password fields to multicity-settings page.
Reorders multicity-elements in booking.

Swaps StacPanel for a grid, to achive the same look as with drive now.
Parses the car-id from booking link.

The json does not contain the car id, just a station-id. So we only get a grip on the car id, when we collect detailed information.
Adds additional translations
Adds booking for multicity by displaying mobilebooking page with prefilled data and code cleanup.
Displays battery instead of fuel-icon for BMW Active Es.
Integrates multicity-booking
Integrates driveNow-ActiveE
Adds comments to about-page that fit the new circumstances.

As booking is now possible for all three carriers the page had to be revised.
Refines multicity booking-process

Now login-errors as well as successful bookings are handled as expected.
Merge branch 'multicity-booking' into develop
Improves useability

Added some margin to the bottom of some settings-pages to keep bottom-most elements readable.
Displays saved credentials.

If credentials for multicity are stored in the app fill in the corresponding boxes on the multicity settings-page.
Merge branch 'multicity-booking' into develop