Properly encode stored boolean fields

* Don't crash when encoding stored boolean fields.

* Add test for boolean, float and string fields.
Use non-ephemeral tmp for Solr package

OSX will delete files from ephemeral without a restart. This causes
Riak rel/stage targets to break in non-obvious way.
Verify correctness of random fruit query

Verify that the correct number of results is found when running random
fruit queries.  Refactored code to be a tad cleaner.
Add PB random fruit search to Yokozuna BB driver
Merge pull request #214 from basho/bugfix/rz/pb-stored-bool

Fix PB search for stored boolean fields