[MapProxy] Patch for TMS source

[Pascal Bihler]

Hi!

In order to make the "cache_tms" source functionality of MapProxy more useful, I added two more options to the configuration:

quadkey: # can be True or False

If this option is set to "True", the request url is constructed as <url>/r<quadkey>.<format> instead of <url>/<z>/<x>/<y>.<format> This is useful for tile servers using the Microsoft Bing addressing scheme (http://msdn.microsoft.com/en-us/library/bb259689.aspx) 

url_format:  # can be "base" or "raw"

If set to "raw", the url is interpreted as a format string instead of just being the tile base url. The following placeholders are being replaced:
if quadkey == False:
	%(z)s - the zoom level
	%(x)s - the tile x coordinate
	%(y)s - the tile y coordinate
	%(format)s - the tile format
if quadkey == True:
	%(q)s - the tile quadkey
	%(format)s - the tile format

Examples: 
	url: http://my.flat.server/%(z)s-%(x)s-%(y)s.%(format)s
	url: http://some.bing.style.server.net/tiles/r%(q)s.png?g=100 # %(format)s left out here...

This option offers way more flexibility in including TMS servers than just assuming that the standard </z/x/y.format> works...

I attached the patch file for the current Mercurial head. Unfortunately, I didn't know how to run the test, so I have to ask the maintainers for adding those. I hope, you'll find the oatch worthy to include it into your project.

Sincerely,
Pascal Bihler

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