Cgiar provider

This is a fix for #204, some minor integration code and testing remains but the data read looks good now. 

 - [x] exclude xml jar from android build
 - [x] let users specify via cmd line
 - [x] test for some local known bike routes
 - [x] test world wide import

Make height more precise for both providers (maybe separate issue):

 - [x] read and interpolate from surrounding height values, see #228