Upgrade to scala 2.10
* Replace ClassManifests with ClassTags
* Denote use of language features (implicits, existencials)
* Stop using deprecated ConcurrentMap and spawn.
* Stop using deprecated spark setJobDescription.
* Avoid catching all Throwables in favor of catching Exception.
remove deprecated use of spawn
Merge branch 'log' of https://github.com/harveyfeng/shark into log
Support reloading Tachyon-backed tables across Shark sessions.