Ccpi forward backprojector (#77)

* added simple test for SinogramData

* initial version of processors

This contains a version of a simple normalization algorithm.

* added default pixel size = 1 (mm)

* Added FindCenter of rotation for parallel beam geometry

closes #5

* WIP for ccpi forward/backprojectors

* WIP

* Added Forward and Backprojectors from ccpi

added processor to pad acquisition data to center on center of rotation.
requires update of ccpi-reconstruction.

* Added simple_demo_ccpi.py

Currently there is a problem with the order of the axis after a projection/backprojection with the ccpi operator.
In the calculation of the PowerMethod there is a wrong order of the axis.
Possibly the creation of the data should be handled by the operator.

* fixed calculation of power method

* further work

* fixed the x_init for the FISTA example

* fixed ccpi FISTA demo

* Fix missing subset call for display

* Added create_image_data method to AstraOperatorSimple

* Stack direction 0, not 2, in TV

* Added finite different forward processor

* wip

* add io to setup.py

* wip

* comment out FiniteDifferentiator

* uniformed algorithm interface

Added some docstring.
Added parsing of opt.

* removed ccpi.io

* little changes

* fix setupCCPiGeometries

* added simple astra demo

* use minimal size for example

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