Lock pyproj to 1.9.6, add test for epsg:2056

Michael Kuenzlirequested to merge
mkuenzli/python-reprojector:lock-pyproj into master

Since the update from pyproj 1.9.6 to the 2.0.0 version, the transform function returns different results for the 4326 to 2056 transformation.

I "fixed" this for me by locking pyproj to version 1.9.6.

I added a test that works with 1.9.6 but not with >=2.0.0

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