Updated the CHANGELOG and upgrades documents for MESOS-1409.
Fixed a bug in docker/docker.cpp that causes unresolved symbols on OSX.

Review: https://reviews.apache.org/r/24825
Fixed master to reject completed frameworks from re-registering.

Review: https://reviews.apache.org/r/20507
Enabled glog signal handler for mesos tests.
Enabled glog signal handler for libprocess tests.
Enabled glog signal handler for stout tests.
Fixed help string for "--attributes" flag.

Review: https://reviews.apache.org/r/24840
Fixed "registered" value in slave's /stats.json.
Report bind parameters on failure.

Review: https://reviews.apache.org/r/24939
MESOS-1208: Add -Wno-unused-local-typedefs if gcc version is >= 4.8

Fixes `MESOS-1208`. The issue is that starting from GCC 4.8, `-Wall` includes `-Wunused-local-typedefs` by default. Since `-Werror` is also present, we end up with an error. I think the better fix would be to update boost, but this fix has less risk.

EDIT: Turns out we were already handling this, but only for GCC 4.8. Modify `configure.ac` to handle it for >= GCC 4.8 instead.

Review: https://reviews.apache.org/r/24816
Allow multiple colons for docker image.

Review: https://reviews.apache.org/r/24916
Updates latest version number in Getting Started documentation, and updates index of documentation files to reference recently-added docs.
Adds link to Authorization doc in documentation home, and updates punctuation to be consistent.
Adds Oscar Insurance and Squarespace to PoweredByMesos page.
Fixed the build error in routing tests.

Review: https://reviews.apache.org/r/24902
Fixed MesosContainerizer to reject tasks that have ContainerInfo set.

Review: https://reviews.apache.org/r/25033
Log the uid and pid when receiving a SIGTERM.

Review: https://reviews.apache.org/r/24700
Refactored the JSON output streaming.

Review: https://reviews.apache.org/r/24877
Adjustments for new JSON streaming.

Review: https://reviews.apache.org/r/25053
Added logging when master/slaves/frameworks bind to loopback address.

Review: https://reviews.apache.org/r/25055