Update CQLSSTableWriter to allow parallel writing of SSTables on the same table within the same JVM

Patch by Carl Yeksigian, reviewed by Benjamin Lerer for CASSANDRA-7463
fix broken build - damnit, carl
Abort startup if ports are in use (Windows)

patch by jmckenzie, reviewed by pthompson for CASSANDRA-8179
Fix shutdown when run as Windows service

patch by jmckenzie, reviewed by pthompson for CASSANDRA-8136
Fix typo in cqlsh insert documentation

Patch by Ricardo Devis Agullo; reviewed by Tyler Hobbs for
CASSANDRA-4959
Merge branch 'cassandra-2.0' into cassandra-2.1
Make sure unfinished compaction files are removed.

Patch by marcuse; reviewed by yukim for CASSANDRA-8124
Refactor how we track live size

Patch by marcuse; reviewed by yukim for CASSANDRA-7852
Improve client notification that nodes are ready for requests

Patch by Brandon Williams, reviewed by thobbs for CASSANDRA-7510
Merge branch 'cassandra-2.0' into cassandra-2.1

Conflicts:
	CHANGES.txt