Add: test for search behaviour.

The current implementation does not return the num_found value from
riak. This commit adds an explict test for the search api output from the client.

Also cleanup Vagrantfile and provisioning to support search testing.
(search needs to enabled on the search_test bucket).
bump protobuf.js dependency
1.0.10
update deps
Change: enable search on travis.

Switch to spec as the default mocha reporter.
Change: switch to leveldb backend in riak on travis.
fix merge conflict
Merge branch 'search_response_test' of github.com:nlf/riakpbc into search_response_test
Merge pull request #38 from nlf/search_response_test

Add: test for search behaviour.