Causal compression and trivial compression are now separated.
Only causal compression can be dumped for the moment.

Examples have been modified because causal compression without trivial compression does not scale up.
Bug correction:
Simulation hangs when unary rate is infinite and no unary instance
exists.
Scope for unary/binary rules
Scope for binary/unary rules
debugging
Scope for unary/binary rates
Cleaning up code
nightly build for mac
Correcting issue #78
Merge pull request #3 from jkrivine/master

Keep updated