xigt module missing __version__ string

[goodmami]

A __version__ string should be added to xigt/__init__.py. It should become 1.1.0 for the next release. 1.0.0 was not in the 1.0 release, so it probably shouldn't be used since it's no longer true after something has been committed, so let's use 1.0.1 for the first one.

After some research, it seems a good method is to put it in a separate module (e.g. version.py) then read (NOT import) it from setup.py, but import it from __init__.py.

See here and here and here

[goodmami]

Or the Warehouse method seems nice, too.

[goodmami]

This was fixed in 291e4bf