Make status check case insensitive

[agrrh]

No description provided.

[jvanasco]

Yeah, I had seen that in the source:

Line 214 also has this:

        results[check_result.attrib['Domain']] = check_result.attrib['Available'] == 'true'

it might be better as:

        results[check_result.attrib['Domain']] = check_result.attrib['Available'].lower() == 'true'

I don't know how stable this particular endpoint or true is, but I've seen False and false in the same domain_info response as attributes to different xml nodes