Extract Tachyon interface to allow pluggable off-heap storage clients
Enable OFF_HEAP caching via "CACHE <table> IN off_heap"
Retitle "tachyon" to "off-heap" everywhere.
Properly handle uncaching/recaching tables
Address Reynold's and Harvey's comments
Address Round # 2 of Harvey's clients
Add comment to SharkEnv re: SHARK_OFFHEAP_CLIENT_FACTORY
Merge pull request #316 from aarondav/master

Extract Tachyon interface to allow pluggable off-heap storage clients