bucket types

[bookshelfdave]

• integration tests do not use bucket types yet, this is coming in a later PR
• needs a Valgrind run in BOS

[hazen]

Tests checkout on both a 1.4.7 and a 2.0.0pre18 cluster. Ad hoc testing seems to work on:

• get
• put
• list keys
• list buckets
• delete
• server-info
• ping :+1: