Fixed a 404 -- missing '.html'
Merge pull request #460 from markhamstra/404

Fixed a 404 in 'Tuning Spark' -- missing '.html'
Update issue tracker link in contributing guide.
Update Windows scripts to launch daemons with less RAM and fix a few
other issues

Conflicts:
	run2.cmd
Tweak web UI so that people don't get confused about master URL format

Conflicts:
	core/src/main/twirl/spark/deploy/master/index.scala.html
	core/src/main/twirl/spark/deploy/worker/index.scala.html
Use a separate memory setting for standalone cluster daemons

Conflicts:
	docs/_config.yml
Detect hard crashes of workers using a heartbeat mechanism.

Also fixes some issues in the rest of the code with detecting workers this way.

Conflicts:
	core/src/main/scala/spark/deploy/master/Master.scala
	core/src/main/scala/spark/deploy/worker/Worker.scala
	core/src/main/scala/spark/scheduler/cluster/SparkDeploySchedulerBackend.scala
	core/src/main/scala/spark/scheduler/cluster/StandaloneClusterMessage.scala
	core/src/main/scala/spark/scheduler/cluster/StandaloneSchedulerBackend.scala
Some bug and formatting fixes to FT

Conflicts:
	core/src/main/scala/spark/scheduler/cluster/SparkDeploySchedulerBackend.scala
	core/src/main/scala/spark/scheduler/cluster/StandaloneSchedulerBackend.scala
Initial cut at replacing K, V in Java files
Indentation fix
Fix for flatmap
Fix for MapPartitions
small fix
Using tuple swap()
Fixed an exponential recursion that could happen with doCheckpoint due
to lack of memoization
Formatting fixes
SPARK-696: sortByKey should use 'ascending' parameter
Merge pull request #465 from pwendell/java-sort-fix

SPARK-696: sortByKey should use 'ascending' parameter
Merge pull request #464 from pwendell/java-type-fix

SPARK-694: All references to [K, V] in JavaDStreamLike should be changed to [K2, V2]
STREAMING-50: Support transform workaround in JavaPairDStream

This ports a useful workaround (the `transform` function) to
JavaPairDStream. It is necessary to do things like sorting which
are not supported yet in the core streaming API.