Add Kelowna 2012 imagery source

Rational for setting default:

* Far superior colour and contrast
* Age within 6 months of bing
* Better alignment to GPX in hills
* Equal alignment to GPX downtown
* Probably more accurate anyways, being taken for the city's GIS department
* 10cm/px imagery, while bing is ~50cm/px

Shortfalls
* Not hosted on a server as powerful as Bing
Merge pull request #40 from pnorman/kelowna2012

Add Kelowna 2012 imagery source
Try to get travis to build all branches including gh-pages
Add Kelowna roads overlay, keep names of roads and imagery similar
add basemap.at layer

This is a basemap of Austria based on government data. It includes
streets (with name/ref), buildings, housenumbers, natural features
(mountains, landuses/landcover, etc.).
Merge pull request #43 from tyrasd/basemapat

add basemap.at layer
Add TIGER 2013 layer.
Merge pull request #44 from ericfischer/tiger-2013-layer

Add TIGER 2013 layer.
Merge pull request #41 from pnorman/kelowna_roads

Add Kelowna roads overlay, keep names of roads and imagery similar
Add OS Townplans for Scotland with permission from NLS
Cast coordinates to float (fixes #39)
Kelowna Roads overlay should not be default

Also remove inaccurate description.
Update Lithuania ORT10LT imagery attribution and enter polygon

Same as http://josm.openstreetmap.de/wiki/Maps/Lithuania#ORT10LTLithuania
Merge pull request #45 from ramunasd/gh-pages

Update Lithuania ORT10LT imagery attribution and enter polygon
Rebuild with ORT10LT