Modifications on the SG approach, still not working well, implementation of the visualization of i=f(sigma)
Merge remote-tracking branch 'upstream/master'

Conflicts:
	pyFAI-src/blob_detection.py
correction of the nearest peak, and of the SG correction
Before fetching, correction on the SG part
Merge remote-tracking branch 'upstream/master'

Conflicts:
	pyFAI-src/blob_detection.py
Changing some parameters
Merge remote-tracking branch 'upstream/master'
Before fetching
Merge remote-tracking branch 'upstream/master'
a bit documentation on how calibration works
Inserting comments and doc
Merge remote branch 'aurore/master'

Conflicts:
	doc/source/calibration.rst
option to validate calibration
work on sphinx documentation
update version to 0.94 for documentation
tool to generate manuals
script got executable
Update Changelog for 0.9.4
update doc
work on doc