Unified status update logging in the master.

Review: https://reviews.apache.org/r/23661
Fixed a clang compilation issue in master.cpp.
Fixed the checkpoint configuration bug in example frameworks.

Review: https://reviews.apache.org/r/23561
Generate u32 filter handle in user level to work around MESOS-1617.

Review: https://reviews.apache.org/r/23701
Updated the release guide for removing old releases from svn.
Do not require the SlaveID in reconciliation requests.

Review: https://reviews.apache.org/r/23542
Fixed a bug in the test environment for disabling certain cgroups tests.

Review: https://reviews.apache.org/r/23781
Minor fix for libev-unbundled in python setup.

Review: https://reviews.apache.org/r/23785
Removed unnecessary includes and inline definitions.

Dominic's Hamon review request: https://reviews.apache.org/r/18295
mergeable to today's master version, this is a lightened version to
make review easier.  Note I see an improvements of ~7.5% of the
compile time.

Review: https://reviews.apache.org/r/23745
More docs for attributes and resources.

Review: https://reviews.apache.org/r/23752
Removed trailing '/' in Makefile.am.

Review: https://reviews.apache.org/r/23829
Introduce script for generating test coverage report.

Review: https://reviews.apache.org/r/23828
Add back declaration of stream operator.

Review: https://reviews.apache.org/r/23873