ENH: Add a script to update the ITK tag in Python setup.py files

[jhlegarreta]

Add a script to update the ITK tag in Python setup.py files.

[jhlegarreta]

A few comments:

• This will surely need further testing.
• jq must be available.
• Assuming that the requirement field is not empty.
• Assuming that no changes are made to the = or >= symbol (although we will want to change to the latter I guess).
• Assuming all tags have the v prefix.
• We may need to ask for the username so that the user is authenticated in the curl command. I think there is a limit in the anonymous gets.
• I guess generating a branch and automatically committing/pushing as @hjmjohnson has done in some scripts is also doable, but this is a first version.

[thewtex]

Cool!

[dzenanz]

Great!

[jhlegarreta]

Superseded by #641 for the reasons stated in #634.