Bump Cassandra to version 1.2.8.

Makefile

@@ -2,7 +2,7 @@ include config.mk
 
 PROJECTS = FilePusher SysFsPusher CollectAgent ParastationProvider
 DISTFILES = thrift-0.9.0.tar.gz;https://dist.apache.org/repos/dist/release/thrift/0.9.0/thrift-0.9.0.tar.gz \
-		apache-cassandra-1.2.6.tar.gz;http://mirror.netcologne.de/apache.org/cassandra/1.2.6/apache-cassandra-1.2.6-bin.tar.gz \
+		apache-cassandra-1.2.8.tar.gz;http://mirror.netcologne.de/apache.org/cassandra/1.2.8/apache-cassandra-1.2.8-bin.tar.gz \
 		mosquitto-1.1.3.tar.gz;http://mosquitto.org/files/source/mosquitto-1.1.3.tar.gz \
 		rudeconfig-5.0.5.tar.gz;http://rudeserver.com/config/download/rudeconfig-5.0.5.tar.gz \
 		boost_1_54_0.tar.gz;http://netcologne.dl.sourceforge.net/project/boost/boost/1.54.0/boost_1_54_0.tar.gz