Refine connection logic
More detailed error tuples
Handle error tuple correctly in cberl:get/2
Missed a few
added a test for sanity checking mgets

This is added to work towards fixing #43
test with mget with 1000 keys
Don't pass in non-empty body when querying view
Ease testing against non local couchbase

to make it easier to debug issues like #39 the conenction definition for
couchbase has been centralized so it can be switched against a remote
server.

Closes: #45
Support IOlists for keys