make tensor.expand create a tensor from correct type, not default type.
add referenced function to disable/enable indexing/referencing behaviour of the writeObject mechanism.
reverse logic on referenced
add isReferenced function to querry the referenced state
Raise error("interrupted!") when torch-qlua is interrupted by ctrl-C.
Merge pull request #110 from fidlej/topic_lstop

Raise error("interrupted!") when torch-qlua is interrupted by ctrl-C.