Revert "Fixed ARG_MAX compilation issue on some POSIX systems."

This reverts commit d8da5f4d17d3a673beb5b76d0a7370bdda99c51d.

Review: https://reviews.apache.org/r/14860
Revert "Added a missing include."

This reverts commit b9e6ce6e9ccbf08ae8a6a666c09391b407a3d82a.

Review: https://reviews.apache.org/r/14861
Revert "Updated the balloon tests to test the memory threshold."

This reverts commit ebba5c109d17fac2a18c16467097846f398e7217.

Conflicts:
	src/examples/balloon_framework.cpp
	src/tests/script.cpp

Review: https://reviews.apache.org/r/14862
Revert "Added memory threshold notifications for inducing OOMs."

This reverts commit 8d742395b77cb9fb95cf5fdc123545aeb69f5c48.

Review: https://reviews.apache.org/r/14863
Fixed mesos.pom to work from inside the build directory.

Review: https://reviews.apache.org/r/14706
MESOS-518: Improve README with Markdown
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/mesos