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

Also, correct some other errors in the README.
Add unit test for default resolver
Add failing test for setting client's resolver to None.
Allow the client to return default_resolver when the resolver attribute is set to None.
Set return_body to True by default for datatype updates.

This addresses #344, and also resolves a bug where the HTTP interface
uses 'returnbody' and not 'return_body'.
Add warnings about listing keys in production
Replace with warning text found in the bucket operations
Merge pull request #354 from basho/jrd/listkey/warnings

Add warnings about listing keys in production

Reviewed-by: seancribbs
Update documentation for multiget to address #313.
Merge pull request #285 from basho/bugfix/sdc/gh285-default-resolver

Setting resolver to None should be like setting it to default

Reviewed-by: javajolt
Merge pull request #344 from basho/bugfix/344-context-handling

Consider managing context more aggressively

Reviewed-by: javajolt
Merge pull request #313 from basho/bugfix/gh313-multiget-docs

multiget does not always return RiakObjects, as stated in documentation

Reviewed-by: javajolt
Remove stray print statement.
Merge pull request #355 from basho/bugfix/stray-print-statement

Remove stray print statement.

Reviewed-by: javajolt
Make PB the default protocol.
Fix other spots where 'http' was remaining.
Remove deprecated features.
Add properities to cache certificiates in `SecurityCreds`
Merge pull request #328 from basho/feature/gh328-remove-deprecated-features

Remove deprecated features

Reviewed-by: javajolt
Merge pull request #352 from basho/feature/bch/cache-certs

Cache Certificates in SecurityCreds

Reviewed-by: seancribbs