Rename last_sign_in_with_authy to last_sign_in_with_authy_at

[philnash]

As pointed out in #154 the last_sign_in_with_authy column breaks the convention of naming date columns with _at at the end, particularly mismatching with devise's last_sign_in_at and current_sign_in_at.

This is a breaking change and would have to be considered for those already using the existing column name. Could add an alias method to the resource so that the column is last_sign_in_with_authy_at but you could also call it from last_sign_in_with_authy.

[philnash]

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