Re-add exports to the top-level. Closes #193.
Add RiakLink to top-level exports and fix pep8 problems.
Fix pyflakes warning in util.py about redefinition of 'getter' method.
Merge pull request #198 from basho/sdc-export-toplevels

Re-add exports to the top-level. Closes #193.
Merge pull request #199 from basho/sdc-fix-redef-warning

Fix pyflakes warning in util.py about redefinition of 'getter' method.