Web3-klaytn

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* Changes to the ``Contract`` API:
* ``Contract.deploy()`` parameter arguments renamed to args
* ``Contract.deploy()`` now takes args and kwargs parameters to allow
constructing with keyword arguments or positional arguments.
* ``Contract.pastEvents`` now allows you to specify a ``fromBlock or
``toBlock.`` Previously these were forced to be ``'earliest'`` and
``web3.eth.blockNumber`` respectively.
* ``Contract.call``, ``Contract.transact`` and ``Contract.estimateGas`` are now
callable as class methods as well as instance methods. When called this
way, an address must be provided with the transaction parameter.
* ``Contract.call``, ``Contract.transact`` and ``Contract.estimateGas`` now allow
specifying an alternate address for the transaction.
* ``RPCProvider`` now supports the following constructor arguments.
* ``ssl`` for enabling SSL
* ``connection_timeout`` and ``network_timeout`` for controlling the timeouts
for requests.

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* Bugfix: Fix KeyError in merge_args_and_kwargs helper fn.

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* Bugfix for usage of block identifiers 'latest', 'earliest', 'pending'
* Sphinx documentation
* Non-data transactions now default to 90000 gas.
* Web3 object now has helpers set as static methods rather than being set at
initialization.
* RPCProvider now takes a ``path`` parameter to allow configuration for requests
to go to paths other than ``/``.

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* TestRPCProvider no longer dumps logging output to stdout and stderr.
* Bugfix for return types of ``address[]``
* Bugfix for event data types of ``address``

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* All transactions which contain a ``data`` element will now have their gas
automatically estimated with 100k additional buffer. This was previously
only true with transactions initiated from a ``Contract`` object.

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* Contract functions can now be called using keyword arguments.