Upgrade to Cassandra 2.1 as Hector 2.0-0 is compatible with it

Reset default to Cassandra 1.1.2 for compatibility with older jobs
Removal of JLine due to BSD-4 license non compatible with Apache 2.0 license
TBD-1018 Correction different behaviour between Hector 1.x and 2.x

ColumnSlice.getColumnByName() returns null in 2.x