add WMS support

[halset]

Long time ago, I added a RMWMSSource to /route-me/route-me. This is the same thing but with some minor changes from my project + some changes to confirm with the mapbox fork.

Example (from RMWMSSource.h):
RMWMS *wms = [[RMWMS alloc] init];
wms.urlPrefix = @"http://vmap0.tiles.osgeo.org/wms/vmap0";
wms.layers = @"basic";
RMWMSSource *wmsSource = [[RMWMSSource alloc] init];
wmsSource.wms = wms;
wmsSource.uniqueTilecacheKey = @"abc";
[mapView setTileSource:wmsSource];

[halset]

@incanus, can you take a look at this?

[incanus]

Will try to. YOu could also submit directly to https://github.com/Alpstein/route-me for possibly faster results, but I will try to check this out :-)

[halset]

Thanks, @incanus . I have added it to Alpstein as well - Outdooractive/route-me#133

[halset]

The Alpstein pull request is merged. Will you merge over the WMS stuff from Alpstein @incanus ? If so, I guess this pull request can be closed.

[incanus]

Yep, will be watching. I've got a big pull request that I'm waiting on first.

[incanus]

I'll close here, as I'll take this down from Alpstein as soon as I can per normal dev cycle.