Changes for 1.4.0-RC2

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Known issues

Performance regressions (may be fixed?):
- Massive Performance Regression with Nested Groups blocker Epic-Performance in progress scaling @mpark
- Marathon has a cap at 2664 apps. analyze blocker Epic-Performance in progress scaling @aquamatthias @jasongilanfarr
Marathon startup script doesn't handle spaces properly. The Marathon bin/marathon-framework launcher script will attempt to convert arguments to environment variables, and fails to handle spaces in values.

Marathon does not re-use reserved resources for which a lost task is associated. In the event that a resident task becomes lost (due to a somewhat common event such as rebooting the host on which the mesos agent and task are running), then the resident task becomes Unreachable. Once it becomes this state, Marathon will consider the task gone and create additional reservations (it should probably wait until it becomes UnreachableInactive to do this). Even though the prior reservation is re-offered, Marathon will not use it.