Merge pull request #19 from rshkarin/master

Add measures of phase retrieval to docs
writer: fix memory leak
Always generate at least 2D images
Fix expected dimensions
Rewrite zeropadding kernel. Removing cut-sinogram filter from DFI pipeline.
Merge pull request #20 from ufo-kit/zeropadding-filter-fix

Rewrite zeropadding kernel. Removing cut-sinogram filter from DFI pipeline.
Store filter coefficients
Merge pull request #21 from ufo-kit/phase-filter-store-coefs

Store filter coefficients
Merge pull request #22 from rshkarin/master

Update docs of phase retrieval
Fix doc strings
Enable dynamic angle offset setting
Merge pull request #23 from ufo-kit/make-offsets-dynamic

Enable dynamic angle offset setting
Fix cl_mem memory leaks
Update LUTs when offset is written not read
Reset correct LUT mem
Fix tests for ufo-core HEAD
Fix some kernel problems
Fix phase retrieval kernel
Add stripe removal