Pockets

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* Renames pockets.string.slug -> sluggify

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Adds the following functions and classes:

* pockets.collections.groupify
* pockets.collections.keydefaultdict
* pockets.collections.nesteddefaultdict
* pockets.collections.readable_join
* pockets.datetime.ceil_datetime
* pockets.datetime.floor_datetime
* pockets.datetime.round_datetime
* pockets.datetime.timedelta_total_seconds
* pockets.decorators.argmod
* pockets.inspect.unwrap
* pockets.string.fieldify
* pockets.string.unfieldify
* pockets.string.slug

Additionally renames the following classes (the original names
are still exported for backwards compatibility):

* pockets.iterators.modify_iter -> itermod
* pockets.iterators.peek_iter -> iterpeek

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* Renames pockets.inspect.is_data_attr to pockets.inspect.is_data

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* Adds pockets.decorators module
* Adds pockets.inspect.is_data_attr function

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* Adds pockets.inspect.collect_subclasses
* Adds pockets.inspect.collect_superclasses
* Adds pockets.inspect.collect_superclass_attr_names

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* Renames IndentMultilinesLogFormatter to IndentMultilineLogFormatter
* Adds cls parameter to pockets.collections.uniquify function