Merge pull request #9 from gaillard/master

Add Util::callStatic method.
Merge pull request #10 from gaillard/master

Add overwrite option to embedInto()
Numerically indexed $keyMap

Allow $keyMap to be numerically index in
\DominionEnterprises\Util\Arrays::copyIfKeysExists(). If the array is
numerically index, the values will be both source and destination keys
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Merge pull request #11 from chadicus/master

Couple changes