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
add sleep before talking to shark server
Merge pull request #224 from marmbrus/scala-2.10

Upgrade to scala 2.10
Merge branch 'master' of https://github.com/amplab/shark