Get projections parameters from server

[monodo]

Minor issue: prjdefs.js loads a lot of information that will, most of the time, not be used. Maybe we should better get it from server.

[mparkan]

It could possibly be obtained from http://spatialreference.org/ as well. For example, the proj4 string for epsg:21781 can be obtained with the following url:

http://spatialreference.org/ref/epsg/21781/proj4/

However, the proj4 definition does not include the title of the projection, so using the OGC WKT definition instead is probably the way to go:

http://spatialreference.org/ref/epsg/21781/ogcwkt/