Add destroy tests for docker containerizer.
Added check for apr and svn headers besides libraries

Review: https://reviews.apache.org/r/27701
Added check for apr and svn headers besides libraries in 3rdparty

Review: https://reviews.apache.org/r/27704
Always recover 'completed' in RunState.

Review: https://reviews.apache.org/r/27738
Adds CRP-Gabriel Lippmann to adopters list.
Abort if Future::failure() is called on non-failed Future

Review: https://reviews.apache.org/r/27831/
Adds Revisely to Mesos adopters list.
Fixed MasterAuthorizationTest.DuplicateReregistration test.

Review: https://reviews.apache.org/r/27832
Future::failure should have a const ref return.

Review: https://reviews.apache.org/r/27826
Fixed MasterAuthorizationTest.FrameworkRemovedBeforeRegistration test.
Added Daemon

Review: https://github.com/apache/mesos/pull/29
Fixes YAML header in Mesos containerizer doc.
Introduced ClangFormat to Mesos.

Review: https://reviews.apache.org/r/26069
Added missing ZooKeeper patch file to the Makefile.
Check for non-zero status code and hadoop client not found.

The fetcher would detect the condition where hadoop returns a success in
case of a success non zero value.

Review: https://reviews.apache.org/r/27670
Updated download instructions to latest version.

Changed the url and file name in `wget` and in `tar -zxf` commands
respectively.

This closes: #30
Review: https://github.com/apache/mesos/pull/30
Introduced TASK_ERROR for unrecoverable errors

Review: https://reviews.apache.org/r/27685
Introduce mutex configure check

* Introduce mutex to the configure check
* Document availability of mutex in style guide

Review: https://reviews.apache.org/r/27354
Introduce enable_shared_from_this configure check

* Introduce enable_shared_from_this to the configure check
* Document availability of enable_shared_from_this in style guide

Review: https://reviews.apache.org/r/27356
Added CRAM-MD5 Test Authenticatee Module.

Review: https://reviews.apache.org/r/27493