Update CHANGELOG file bringing 0.9.0 in sync with JIRA.
MESOS-460: Remove LICENSE info from NOTICE: progress towards cleaning up LICENSE file too.
Fixed os::memory() and fs::available() to return Bytes.

Review: https://reviews.apache.org/r/10813
Fixed slave to use Bytes version of memory and disk.

Review: https://reviews.apache.org/r/10814
Fixed garbage collection to allow for disk head room.

Review: https://reviews.apache.org/r/10938
Fixed process isolator to safely setup launcher's environment.

Review: https://reviews.apache.org/r/10879
Simplify os::hostname() in libstout.
Run Hadoop tutorial binaries from within build dir.
Include pre/post-package hook scripts in Hadoop tutorial.
Allow ending Hadoop tutorial early.

Allow someone to end tutorial after building/packaging complete.  You
can also skip the test part by exporting SKIP_TESTS (i.e., 'make hadoop
SKIP_TESTS=1').
Use XZ (LZMA) for package on Linuxes.
Build fix for HadoopPipes.cc with GCC 4.7.
Check for Python.h in configure script.
Use more portable paths for tutorial test.
Improve MesosScheduler for Hadoop.

We'll try to allocate map/reduce slots in such a way that we ensure we
utilize the entire cluster effectively.  We'll use up to the maximum
desired number of map/reduce slots, starting from a minimum of 1 map or
1 reduce slot.
Don't prematurely kill TaskTrackers.

We assign the JobID to the internal Mesos tracker (for the TaskTracker)
rather than the TaskID.

In the case where a TaskTracker has only map tasks assigned to it and
they have all completed, we mustn't terminate the tracker until the
entire job has finished, including the map tasks.
Hadoop tutorial version bump (CDH4.2.0 -> 4.2.1).
Shuffle offers before sending to frameworks.

This helps ensure fair allocation of resources.
Slave feature: maximum system load.

When the load exceeds a specified value, don't accept tasks.  Some nodes
may become unstable under excessive load (i.e., heavy disk I/O), and
this helps prevent the assigning of further tasks to busy slaves.
Log executor output to syslog.