Test commit karma for Spark git.
Merge remote-tracking branch 'old/master'
Merge remote-tracking branch 'old/master'
Merge remote-tracking branch 'old/master'
Removed repetative import; fixes hidden definition compiler warning.
Adding algorithm for implicit feedback data to ALS
Construct shell commands as sequences for safety and composability
Generate new SSH key for the cluster, make "--identity-file" optional
Add explicit jets3t dependency, which is excluded in hadoop-client
Remove MemoryStore$Entry.dropPending, unused as of 42e0a68082.
SPARK-894 - Not all WebUI fields delivered VIA JSON
Merge pull request #925 from davidmccauley/master

SPARK-894 - Not all WebUI fields delivered VIA JSON
Change port from 3030 to 4040
Merge pull request #922 from pwendell/port-change

Change default port number from 3030 to 4030.
Merge pull request #919 from mateiz/jets3t

Add explicit jets3t dependency, which is excluded in hadoop-client
Changed localProperties to use ThreadLocal (not DynamicVariable).

The fact that DynamicVariable uses an InheritableThreadLocal
can cause problems where the properties end up being shared
across threads in certain circumstances.
Clarify error messages on SSH failure
Updated Spark on Mesos documentation.
More updates to Spark on Mesos documentation.
Merge pull request #927 from benh/mesos-docs

Updated Spark on Mesos documentation.