Prevent SSP from erroring out when the yaml is yanked from it.

Patch by brandonwilliams, reviewed by Richard Low for CASSANDRA-7663
Merge branch 'cassandra-1.2' into cassandra-2.0

Conflicts:
	src/java/org/apache/cassandra/locator/SimpleSeedProvider.java
Add new GC flags for java7/8

Patch by brandonwilliams, reviewed by jbellis for CASSANDRA-7432
Add stop method to EmbeddedCassandraService

patch by lyubent; reviewed by slebresne for CASSANDRA-7595
Merge branch 'cassandra-1.2' into cassandra-2.0

Conflicts:
	CHANGES.txt
Merge branch 'cassandra-2.0' into cassandra-2.1.0

Conflicts:
	CHANGES.txt