Added requirements.txt, removed _build.
Updated requirements.txt.
Updated requirements.txt.
Updated requirements.txt.
Fix docstring indentation to avoid sphinx warnings.

No change in code functions.
Delay import of fabio until reading the image file.

This allows to import the module for docstring extraction
by Pythons with no fabio.
Use full module path in sphinx autodoc.
Merge branch 'master' of https://github.com/pavoljuhas/pyxda
include base project directory in pythonpath when compiling the docs.