Affine-transform

Additions
- Support for float32 and float64 without copy
- Added documentation about how different data-types are treated

Changes
- Fixed data-types other than float64 leading to an empty output
- Fixed issues with some paramters being passed as integers

Changes
- Fixes to MANIFEST.in
- Fixes to setup.py

Changes
- Fixed setup of package to produce a proper sdist

Additions

- Output image can now have arbitrary shape
- Origin of output image can be set
- Badges, more CI integration

Additions

- Up to 5D affine transform
- Linear and cubic interpolation
- Constant boundary values supported