Remove protobuffs link as it is handled as a proper dependency now.

Also, correct some other errors in the README.
Add `basic_quorum` and `notfound_ok` request options on get.

I originally set out to investigate the deletedvclock issue in #332,
but discovered that these quorum parameters were missing.
Merge pull request #353 from basho/bugfix/missing-quorum-params

Add basic_quorum and notfound_ok request options on get.

Reviewed-by: javajolt
Merge pull request #337 from basho/bugfix/gh337

README pb link bug

Reviewed-by: javajolt
Allow manual acquire/release of pool resources.

* Rename `take` to `transaction`.
* Extract acquisition and release phases of `transaction` into
  `acquire` and `release` methods.
* Rename `element` to `resource` to more accurately describe what is
  in the pool.
* Added test for manual acquire/release.
Fix one forgotten reference to `elements` rather than `resources`
Add ability for streams to release the transport object back to the pool.
Allow unwrapped connection acquisition in client operations.

Resources may now release themselves back to the pool, rather than
requiring the caller to have a reference to the pool.
Change streaming operations to manually acquire connections.

This will require the caller to exhaust the iterator, use
contextlib.closing or manually close the generator when done.
Document the requirement to close the iterator
Fix PEP8 errors
Use close() instead of shutdown() on the socket when destroying the connection.
Merge pull request #357 from basho/bugfix/streaming-conn-leak

Fix connection leaks when streaming

Reviewed-by: javajolt
Allow setting the size of the multiget pool at client initiation time.

It is safe to create multiple multiget pools because fetcher threads
aren't started until the pool is first used. Client objects that don't
modify the multiget_pool_size will use the predefined pool.
Add test for tweaking the multiget pool size.
Merge pull request #305 from basho/bugfix/gh305-override-multiget-pool-size

Ability to override multiget pool size

Reviewed-by: javajolt
Require a CA Cert in a SecurityCreds object and via SSL
Standardize Sphinx :class: notation to use `py` default-domain
Fix https://github.com/basho/riak-python-client/issues/146 as stated in the
issue itself (Map/Reduce frequently throws riak.RiakError).
Merge pull request #361 from serenabiodec/master

Fix https://github.com/basho/riak-python-client/issues/146

Reviewed-by: seancribbs