Updated a comment regarding GCC 4.7 in configure.ac and some syntax
formatting.

Review: https://reviews.apache.org/r/25218
Ignore terminal task resources in the Master's Framework struct.

Review: https://reviews.apache.org/r/25844
Fixed an executor accounting bug in framework re-registration.

Review: https://reviews.apache.org/r/25843
Fixed an issue with colored output in post-reviews.py.

Review: https://reviews.apache.org/r/25819
Refactored Node class in libprocess.

Moved class Node out of process.cpp and into its own header as a part
of refactoring process.cpp.

Review: https://reviews.apache.org/r/25847
Allowed co-mounted cgroup subsystems to enable Mesos on machines with
systemd.

Review: https://reviews.apache.org/r/25858
Refactored the environment-based test filtering.

Review: https://reviews.apache.org/r/25569
Removed duplicate error messaging in Docker::create.
Added support for getting socket diagnosis information.

Review: https://reviews.apache.org/r/25948
Added variadic strings join.

There is a second version of the variadic join which takes a reference
to a stringstream as a parameter. This is handy when strings::join is
just a part of a larger string manipulation.

Review: https://reviews.apache.org/r/25789
Refactored libprocess Help to reduce compile time.

Reduces compile time overall by ~1/3rd. Move implementation of
libprocess help into cpp file.  Use strings::join to refactor macro
expansion that was injecting lots of overhead even when the expanded
functions were not used.

Review: https://reviews.apache.org/r/25798
Refactored libprocess class ProcessReference into its own header.

Move class ProcessReference out of process.cpp and into its own header.
Part of refactoring process.cpp.

Review: https://reviews.apache.org/r/25868
Updated semantics of disconnected/deactivated slaves/frameworks in
master.

Review: https://reviews.apache.org/r/25866
Updated ping message to embed the slave connected status.

Review: https://reviews.apache.org/r/25867
Added reconcileTasks to python scheduler.

The last step of wiring up reconcileTasks in the python bindings.

Review: https://reviews.apache.org/r/25986
Normalized and enforced 3rdparty/libprocess conditional include style.

Review: https://reviews.apache.org/r/26056
Dynamically change poll interval in the reaper.

If pid count <= 50 then use 100 ms (<= 0.5% core usage), if count
>= 500 use 1000 ms (<= 1% core usage at 500 pids), else interpolate.

Review: https://reviews.apache.org/r/25947
Adds The Factory to PoweredByMesos documentation.
Added docker container prefix to docker docs.

Review: https://reviews.apache.org/r/26052
Adds OpenCredo and WooRank to PoweredByMesos page.