Initial commit of YCSB.

Creation of git repository and inital commit of YCSB.
Added github links to README.
Added another page link to README
Added lib directory for database jars
Made separate build target for cassandra db
Added ycsb.jar to dbcompile classpath
Separated Cassandra and HBase lib dirs into their own directory
SliceRange changed in 0.6 - fixed CassandraClient.java
Import org.apache.cassandra.thrift.*; (packaged changed in cas 0.6)
Fixing SlicePredicate, ColumnPath and ColumnParent constructors for 0.6 interface
Reran javadoc and fixed some doc bugs
Fixing documentation and javadoc.
Adding documentation.
Added reference to Gray paper.
Fix initial sleep for client thread. closes #4
Added HBase cleanup code fix.  closes #3
Remove call to stringPropertyNames() to make compilable under Java 1.5. closes #5
Merge branch 'master' of github.com:brianfrankcooper/YCSB
Version history in README
Improve CPU usage of random string generation