Construct and read methods should be classmethods

[calum-chamberlain]

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Creating Tribes and Templates should not require an existing class. The current implementation is clumsy: to create a Tribe you would run:

Tribe().construct(...)

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Change .read() and .construct() to @classmethods that allow the following syntax:

Tribe.construct(...)

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Keeping it the way it is is pretty ugly...

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