Fix default timestamp in QueryOptions

patch by beobal; reviewed by slebresne for CASSANDRA-8246
Don't compile Thrift sources in Eclipse, use classes for an ant build

patch by Mikhail Stepura; reviewed by tjake for CASSANDRA-8250
Attach existing sources to "Referenced libraries" in Eclipse

Patch by Mikhail Stepura; reviewed by tjake for CASSANDRA-8240
Merge branch 'cassandra-2.1' into trunk