Merge pull request #1 from GiannisA/master

Pixel Splitting
Merge pull request #2 from GiannisA/master

Pixel Splitting v2
corrections of equations
image showing side by side diffraction image and integrated profile
Merge remote-tracking branch 'origin/master'

Conflicts:
	papers/Kieffer_Ashiotis/pyFAI.rst
some correction on pixel splitting
about pixel splitting
more structure
work on references
Merge remote-tracking branch 'giannis/master'

Conflicts:
	papers/Kieffer_Ashiotis/pyFAI.rst
biblio
work on text
description of pyFAI
include profiling from OpenCL
references updates
another serie of corrections
fix ref
finished Benchs
added test-figures